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Message-ID: <9c31b697-3d80-407a-82b3-cfbb19fafb31@arm.com>
Date: Thu, 28 Mar 2024 10:16:02 +0000
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Subject: Re: [PATCH 9/9] mmc: Convert from tasklet to BH workqueue
To: Allen Pais <apais@linux.microsoft.com>, linux-kernel@vger.kernel.org
Cc: tj@kernel.org, keescook@chromium.org, vkoul@kernel.org, marcan@marcan.st,
 sven@svenpeter.dev, florian.fainelli@broadcom.com, rjui@broadcom.com,
 sbranden@broadcom.com, paul@crapouillou.net, Eugeniy.Paltsev@synopsys.com,
 manivannan.sadhasivam@linaro.org, vireshk@kernel.org, Frank.Li@nxp.com,
 leoyang.li@nxp.com, zw@zh-kernel.org, wangzhou1@hisilicon.com,
 haijie1@huawei.com, shawnguo@kernel.org, s.hauer@pengutronix.de,
 sean.wang@mediatek.com, matthias.bgg@gmail.com,
 angelogioacchino.delregno@collabora.com, afaerber@suse.de,
 logang@deltatee.com, daniel@zonque.org, haojian.zhuang@gmail.com,
 robert.jarzmik@free.fr, andersson@kernel.org, konrad.dybcio@linaro.org,
 orsonzhai@gmail.com, baolin.wang@linux.alibaba.com, zhang.lyra@gmail.com,
 patrice.chotard@foss.st.com, linus.walleij@linaro.org, wens@csie.org,
 jernej.skrabec@gmail.com, peter.ujfalusi@gmail.com, kys@microsoft.com,
 haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
 jassisinghbrar@gmail.com, mchehab@kernel.org, maintainers@bluecherrydvr.com,
 aubin.constans@microchip.com, ulf.hansson@linaro.org,
 manuel.lauss@gmail.com, mirq-linux@rere.qmqm.pl, jh80.chung@samsung.com,
 oakad@yahoo.com, hayashi.kunihiko@socionext.com, mhiramat@kernel.org,
 brucechang@via.com.tw, HaraldWelte@viatech.com, pierre@ossman.eu,
 duncan.sands@free.fr, stern@rowland.harvard.edu, oneukum@suse.com,
 openipmi-developer@lists.sourceforge.net, dmaengine@vger.kernel.org,
 asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
 linux-rpi-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
 imx@lists.linux.dev, linuxppc-dev@lists.ozlabs.org,
 linux-mediatek@lists.infradead.org, linux-actions@lists.infradead.org,
 linux-arm-msm@vger.kernel.org, linux-riscv@lists.infradead.org,
 linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org,
 linux-hyperv@vger.kernel.org, linux-rdma@vger.kernel.org,
 linux-media@vger.kernel.org, linux-mmc@vger.kernel.org,
 linux-omap@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
 linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-usb@vger.kernel.org
References: <20240327160314.9982-1-apais@linux.microsoft.com>
 <20240327160314.9982-10-apais@linux.microsoft.com>
Content-Language: en-US
From: Christian Loehle <christian.loehle@arm.com>
In-Reply-To: <20240327160314.9982-10-apais@linux.microsoft.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

On 27/03/2024 16:03, Allen Pais wrote:
> The only generic interface to execute asynchronously in the BH context is
> tasklet; however, it's marked deprecated and has some design flaws. To
> replace tasklets, BH workqueue support was recently added. A BH workqueue
> behaves similarly to regular workqueues except that the queued work items
> are executed in the BH context.
> 
> This patch converts drivers/infiniband/* from tasklet to BH workqueue.
s/infiniband/mmc
> 
> Based on the work done by Tejun Heo <tj@kernel.org>
> Branch: https://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-6.10
> 
> Signed-off-by: Allen Pais <allen.lkml@gmail.com>
> ---
>  drivers/mmc/host/atmel-mci.c                  | 35 ++++-----
>  drivers/mmc/host/au1xmmc.c                    | 37 ++++-----
>  drivers/mmc/host/cb710-mmc.c                  | 15 ++--
>  drivers/mmc/host/cb710-mmc.h                  |  3 +-
>  drivers/mmc/host/dw_mmc.c                     | 25 ++++---
>  drivers/mmc/host/dw_mmc.h                     |  9 ++-
For dw_mmc:
Performance numbers look good FWIW.
for i in $(seq 0 5); do echo performance > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor; done
for i in $(seq 0 4); do fio --name=test --rw=randread --bs=4k --runtime=30 --time_based --filename=/dev/mmcblk1 --minimal --numjobs=6 --iodepth=32 --group_reporting | awk -F ";" '{print $8}'; sleep 30; done
Baseline:
1758
1773
1619
1835
1639
to:
1743
1643
1860
1638
1872
(I'd call that equivalent).
This is on a RK3399.
I would prefer most of the naming to change from "work" to "workqueue" in the driver
code.
Apart from that:
Reviewed-by: Christian Loehle <christian.loehle@arm.com>
Tested-by: Christian Loehle <christian.loehle@arm.com>
>  drivers/mmc/host/omap.c                       | 17 +++--
>  drivers/mmc/host/renesas_sdhi.h               |  3 +-
>  drivers/mmc/host/renesas_sdhi_internal_dmac.c | 24 +++---
See inline
>  drivers/mmc/host/renesas_sdhi_sys_dmac.c      |  9 +--
>  drivers/mmc/host/sdhci-bcm-kona.c             |  2 +-
>  drivers/mmc/host/tifm_sd.c                    | 15 ++--
>  drivers/mmc/host/tmio_mmc.h                   |  3 +-
>  drivers/mmc/host/tmio_mmc_core.c              |  4 +-
>  drivers/mmc/host/uniphier-sd.c                | 13 ++--
>  drivers/mmc/host/via-sdmmc.c                  | 25 ++++---
>  drivers/mmc/host/wbsd.c                       | 75 ++++++++++---------
>  drivers/mmc/host/wbsd.h                       | 10 +--
>  18 files changed, 167 insertions(+), 157 deletions(-)
> 
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index dba826db739a..0a92a7fd020f 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -33,6 +33,7 @@
>  #include <linux/pm.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/pinctrl/consumer.h>
> +#include <linux/workqueue.h>
>  
>  #include <asm/cacheflush.h>
>  #include <asm/io.h>
> @@ -284,12 +285,12 @@ struct atmel_mci_dma {
>   *	EVENT_DATA_ERROR is pending.
>   * @stop_cmdr: Value to be loaded into CMDR when the stop command is
>   *	to be sent.
> - * @tasklet: Tasklet running the request state machine.
> + * @work: Work running the request state machine.
>   * @pending_events: Bitmask of events flagged by the interrupt handler
> - *	to be processed by the tasklet.
> + *	to be processed by the work.
>   * @completed_events: Bitmask of events which the state machine has
>   *	processed.
> - * @state: Tasklet state.
> + * @state: Work state.
>   * @queue: List of slots waiting for access to the controller.
>   * @need_clock_update: Update the clock rate before the next request.
>   * @need_reset: Reset controller before next request.
> @@ -363,7 +364,7 @@ struct atmel_mci {
>  	u32			data_status;
>  	u32			stop_cmdr;
>  
> -	struct tasklet_struct	tasklet;
> +	struct work_struct 	work;
>  	unsigned long		pending_events;
>  	unsigned long		completed_events;
>  	enum atmel_mci_state	state;
> @@ -761,7 +762,7 @@ static void atmci_timeout_timer(struct timer_list *t)
>  	host->need_reset = 1;
>  	host->state = STATE_END_REQUEST;
>  	smp_wmb();
> -	tasklet_schedule(&host->tasklet);
> +	queue_work(system_bh_wq, &host->work);
>  }
>  
>  static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
> @@ -983,7 +984,7 @@ static void atmci_pdc_complete(struct atmel_mci *host)
>  
>  	dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
>  	atmci_set_pending(host, EVENT_XFER_COMPLETE);
> -	tasklet_schedule(&host->tasklet);
> +	queue_work(system_bh_wq, &host->work);
>  }
>  
>  static void atmci_dma_cleanup(struct atmel_mci *host)
> @@ -997,7 +998,7 @@ static void atmci_dma_cleanup(struct atmel_mci *host)
>  }
>  
>  /*
> - * This function is called by the DMA driver from tasklet context.
> + * This function is called by the DMA driver from work context.
>   */
>  static void atmci_dma_complete(void *arg)
>  {
> @@ -1020,7 +1021,7 @@ static void atmci_dma_complete(void *arg)
>  		dev_dbg(&host->pdev->dev,
>  		        "(%s) set pending xfer complete\n", __func__);
>  		atmci_set_pending(host, EVENT_XFER_COMPLETE);
> -		tasklet_schedule(&host->tasklet);
> +		queue_work(system_bh_wq, &host->work);
>  
>  		/*
>  		 * Regardless of what the documentation says, we have
> @@ -1033,7 +1034,7 @@ static void atmci_dma_complete(void *arg)
>  		 * haven't seen all the potential error bits yet.
>  		 *
>  		 * The interrupt handler will schedule a different
> -		 * tasklet to finish things up when the data transfer
> +		 * work to finish things up when the data transfer
>  		 * is completely done.
>  		 *
>  		 * We may not complete the mmc request here anyway
> @@ -1765,9 +1766,9 @@ static void atmci_detect_change(struct timer_list *t)
>  	}
>  }
>  
> -static void atmci_tasklet_func(struct tasklet_struct *t)
> +static void atmci_work_func(struct work_struct *t)
>  {
> -	struct atmel_mci        *host = from_tasklet(host, t, tasklet);
> +	struct atmel_mci        *host = from_work(host, t, work);
>  	struct mmc_request	*mrq = host->mrq;
>  	struct mmc_data		*data = host->data;
>  	enum atmel_mci_state	state = host->state;
> @@ -1779,7 +1780,7 @@ static void atmci_tasklet_func(struct tasklet_struct *t)
>  	state = host->state;
>  
>  	dev_vdbg(&host->pdev->dev,
> -		"tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
> +		"work: state %u pending/completed/mask %lx/%lx/%x\n",
>  		state, host->pending_events, host->completed_events,
>  		atmci_readl(host, ATMCI_IMR));
>  
> @@ -2141,7 +2142,7 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
>  			dev_dbg(&host->pdev->dev, "set pending data error\n");
>  			smp_wmb();
>  			atmci_set_pending(host, EVENT_DATA_ERROR);
> -			tasklet_schedule(&host->tasklet);
> +			queue_work(system_bh_wq, &host->work);
>  		}
>  
>  		if (pending & ATMCI_TXBUFE) {
> @@ -2210,7 +2211,7 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
>  			smp_wmb();
>  			dev_dbg(&host->pdev->dev, "set pending notbusy\n");
>  			atmci_set_pending(host, EVENT_NOTBUSY);
> -			tasklet_schedule(&host->tasklet);
> +			queue_work(system_bh_wq, &host->work);
>  		}
>  
>  		if (pending & ATMCI_NOTBUSY) {
> @@ -2219,7 +2220,7 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
>  			smp_wmb();
>  			dev_dbg(&host->pdev->dev, "set pending notbusy\n");
>  			atmci_set_pending(host, EVENT_NOTBUSY);
> -			tasklet_schedule(&host->tasklet);
> +			queue_work(system_bh_wq, &host->work);
>  		}
>  
>  		if (pending & ATMCI_RXRDY)
> @@ -2234,7 +2235,7 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
>  			smp_wmb();
>  			dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
>  			atmci_set_pending(host, EVENT_CMD_RDY);
> -			tasklet_schedule(&host->tasklet);
> +			queue_work(system_bh_wq, &host->work);
>  		}
>  
>  		if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
> @@ -2530,7 +2531,7 @@ static int atmci_probe(struct platform_device *pdev)
>  
>  	host->mapbase = regs->start;
>  
> -	tasklet_setup(&host->tasklet, atmci_tasklet_func);
> +	INIT_WORK(&host->work, atmci_work_func);
>  
>  	ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
>  	if (ret) {
> diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
> index b5a5c6a2fe8b..c86fa7d2ebb7 100644
> --- a/drivers/mmc/host/au1xmmc.c
> +++ b/drivers/mmc/host/au1xmmc.c
> @@ -42,6 +42,7 @@
>  #include <linux/leds.h>
>  #include <linux/mmc/host.h>
>  #include <linux/slab.h>
> +#include <linux/workqueue.h>
>  
>  #include <asm/io.h>
>  #include <asm/mach-au1x00/au1000.h>
> @@ -113,8 +114,8 @@ struct au1xmmc_host {
>  
>  	int irq;
>  
> -	struct tasklet_struct finish_task;
> -	struct tasklet_struct data_task;
> +	struct work_struct finish_task;
> +	struct work_struct data_task;
>  	struct au1xmmc_platform_data *platdata;
>  	struct platform_device *pdev;
>  	struct resource *ioarea;
> @@ -253,9 +254,9 @@ static void au1xmmc_finish_request(struct au1xmmc_host *host)
>  	mmc_request_done(host->mmc, mrq);
>  }
>  
> -static void au1xmmc_tasklet_finish(struct tasklet_struct *t)
> +static void au1xmmc_work_finish(struct work_struct *t)
>  {
> -	struct au1xmmc_host *host = from_tasklet(host, t, finish_task);
> +	struct au1xmmc_host *host = from_work(host, t, finish_task);
>  	au1xmmc_finish_request(host);
>  }
>  
> @@ -363,9 +364,9 @@ static void au1xmmc_data_complete(struct au1xmmc_host *host, u32 status)
>  	au1xmmc_finish_request(host);
>  }
>  
> -static void au1xmmc_tasklet_data(struct tasklet_struct *t)
> +static void au1xmmc_work_data(struct work_struct *t)
>  {
> -	struct au1xmmc_host *host = from_tasklet(host, t, data_task);
> +	struct au1xmmc_host *host = from_work(host, t, data_task);
>  
>  	u32 status = __raw_readl(HOST_STATUS(host));
>  	au1xmmc_data_complete(host, status);
> @@ -425,7 +426,7 @@ static void au1xmmc_send_pio(struct au1xmmc_host *host)
>  		if (host->flags & HOST_F_STOP)
>  			SEND_STOP(host);
>  
> -		tasklet_schedule(&host->data_task);
> +		queue_work(system_bh_wq, &host->data_task);
>  	}
>  }
>  
> @@ -505,7 +506,7 @@ static void au1xmmc_receive_pio(struct au1xmmc_host *host)
>  		if (host->flags & HOST_F_STOP)
>  			SEND_STOP(host);
>  
> -		tasklet_schedule(&host->data_task);
> +		queue_work(system_bh_wq, &host->data_task);
>  	}
>  }
>  
> @@ -561,7 +562,7 @@ static void au1xmmc_cmd_complete(struct au1xmmc_host *host, u32 status)
>  
>  	if (!trans || cmd->error) {
>  		IRQ_OFF(host, SD_CONFIG_TH | SD_CONFIG_RA | SD_CONFIG_RF);
> -		tasklet_schedule(&host->finish_task);
> +		queue_work(system_bh_wq, &host->finish_task);
>  		return;
>  	}
>  
> @@ -797,7 +798,7 @@ static irqreturn_t au1xmmc_irq(int irq, void *dev_id)
>  		IRQ_OFF(host, SD_CONFIG_NE | SD_CONFIG_TH);
>  
>  		/* IRQ_OFF(host, SD_CONFIG_TH | SD_CONFIG_RA | SD_CONFIG_RF); */
> -		tasklet_schedule(&host->finish_task);
> +		queue_work(system_bh_wq, &host->finish_task);
>  	}
>  #if 0
>  	else if (status & SD_STATUS_DD) {
> @@ -806,7 +807,7 @@ static irqreturn_t au1xmmc_irq(int irq, void *dev_id)
>  			au1xmmc_receive_pio(host);
>  		else {
>  			au1xmmc_data_complete(host, status);
> -			/* tasklet_schedule(&host->data_task); */
> +			/* queue_work(system_bh_wq, &host->data_task); */
>  		}
>  	}
>  #endif
> @@ -854,7 +855,7 @@ static void au1xmmc_dbdma_callback(int irq, void *dev_id)
>  	if (host->flags & HOST_F_STOP)
>  		SEND_STOP(host);
>  
> -	tasklet_schedule(&host->data_task);
> +	queue_work(system_bh_wq, &host->data_task);
>  }
>  
>  static int au1xmmc_dbdma_init(struct au1xmmc_host *host)
> @@ -1039,9 +1040,9 @@ static int au1xmmc_probe(struct platform_device *pdev)
>  	if (host->platdata)
>  		mmc->caps &= ~(host->platdata->mask_host_caps);
>  
> -	tasklet_setup(&host->data_task, au1xmmc_tasklet_data);
> +	INIT_WORK(&host->data_task, au1xmmc_work_data);
>  
> -	tasklet_setup(&host->finish_task, au1xmmc_tasklet_finish);
> +	INIT_WORK(&host->finish_task, au1xmmc_work_finish);
>  
>  	if (has_dbdma()) {
>  		ret = au1xmmc_dbdma_init(host);
> @@ -1091,8 +1092,8 @@ static int au1xmmc_probe(struct platform_device *pdev)
>  	if (host->flags & HOST_F_DBDMA)
>  		au1xmmc_dbdma_shutdown(host);
>  
> -	tasklet_kill(&host->data_task);
> -	tasklet_kill(&host->finish_task);
> +	cancel_work_sync(&host->data_task);
> +	cancel_work_sync(&host->finish_task);
>  
>  	if (host->platdata && host->platdata->cd_setup &&
>  	    !(mmc->caps & MMC_CAP_NEEDS_POLL))
> @@ -1135,8 +1136,8 @@ static void au1xmmc_remove(struct platform_device *pdev)
>  		__raw_writel(0, HOST_CONFIG2(host));
>  		wmb(); /* drain writebuffer */
>  
> -		tasklet_kill(&host->data_task);
> -		tasklet_kill(&host->finish_task);
> +		cancel_work_sync(&host->data_task);
> +		cancel_work_sync(&host->finish_task);
>  
>  		if (host->flags & HOST_F_DBDMA)
>  			au1xmmc_dbdma_shutdown(host);
> diff --git a/drivers/mmc/host/cb710-mmc.c b/drivers/mmc/host/cb710-mmc.c
> index 0aec33b88bef..eebb6797e785 100644
> --- a/drivers/mmc/host/cb710-mmc.c
> +++ b/drivers/mmc/host/cb710-mmc.c
> @@ -8,6 +8,7 @@
>  #include <linux/module.h>
>  #include <linux/pci.h>
>  #include <linux/delay.h>
> +#include <linux/workqueue.h>
>  #include "cb710-mmc.h"
>  
>  #define CB710_MMC_REQ_TIMEOUT_MS	2000
> @@ -493,7 +494,7 @@ static void cb710_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  	if (!cb710_mmc_command(mmc, mrq->cmd) && mrq->stop)
>  		cb710_mmc_command(mmc, mrq->stop);
>  
> -	tasklet_schedule(&reader->finish_req_tasklet);
> +	queue_work(system_bh_wq, &reader->finish_req_work);
>  }
>  
>  static int cb710_mmc_powerup(struct cb710_slot *slot)
> @@ -646,10 +647,10 @@ static int cb710_mmc_irq_handler(struct cb710_slot *slot)
>  	return 1;
>  }
>  
> -static void cb710_mmc_finish_request_tasklet(struct tasklet_struct *t)
> +static void cb710_mmc_finish_request_work(struct work_struct *t)
>  {
> -	struct cb710_mmc_reader *reader = from_tasklet(reader, t,
> -						       finish_req_tasklet);
> +	struct cb710_mmc_reader *reader = from_work(reader, t,
> +						       finish_req_work);
>  	struct mmc_request *mrq = reader->mrq;
>  
>  	reader->mrq = NULL;
> @@ -718,8 +719,8 @@ static int cb710_mmc_init(struct platform_device *pdev)
>  
>  	reader = mmc_priv(mmc);
>  
> -	tasklet_setup(&reader->finish_req_tasklet,
> -		      cb710_mmc_finish_request_tasklet);
> +	INIT_WORK(&reader->finish_req_work,
> +			cb710_mmc_finish_request_work);
>  	spin_lock_init(&reader->irq_lock);
>  	cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
>  
> @@ -763,7 +764,7 @@ static void cb710_mmc_exit(struct platform_device *pdev)
>  	cb710_write_port_32(slot, CB710_MMC_CONFIG_PORT, 0);
>  	cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0);
>  
> -	tasklet_kill(&reader->finish_req_tasklet);
> +	cancel_work_sync(&reader->finish_req_work);
>  
>  	mmc_free_host(mmc);
>  }
> diff --git a/drivers/mmc/host/cb710-mmc.h b/drivers/mmc/host/cb710-mmc.h
> index 5e053077dbed..b35ab8736374 100644
> --- a/drivers/mmc/host/cb710-mmc.h
> +++ b/drivers/mmc/host/cb710-mmc.h
> @@ -8,10 +8,11 @@
>  #define LINUX_CB710_MMC_H
>  
>  #include <linux/cb710.h>
> +#include <linux/workqueue.h>
>  
>  /* per-MMC-reader structure */
>  struct cb710_mmc_reader {
> -	struct tasklet_struct finish_req_tasklet;
> +	struct work_struct finish_req_work;
>  	struct mmc_request *mrq;
>  	spinlock_t irq_lock;
>  	unsigned char last_power_mode;
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 8e2d676b9239..ee6f892bc0d8 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -36,6 +36,7 @@
>  #include <linux/regulator/consumer.h>
>  #include <linux/of.h>
>  #include <linux/mmc/slot-gpio.h>
> +#include <linux/workqueue.h>
>  
>  #include "dw_mmc.h"
>  
> @@ -493,7 +494,7 @@ static void dw_mci_dmac_complete_dma(void *arg)
>  	 */
>  	if (data) {
>  		set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
> -		tasklet_schedule(&host->tasklet);
> +		queue_work(system_bh_wq, &host->work);
>  	}
>  }
>  
> @@ -1834,7 +1835,7 @@ static enum hrtimer_restart dw_mci_fault_timer(struct hrtimer *t)
>  	if (!host->data_status) {
>  		host->data_status = SDMMC_INT_DCRC;
>  		set_bit(EVENT_DATA_ERROR, &host->pending_events);
> -		tasklet_schedule(&host->tasklet);
> +		queue_work(system_bh_wq, &host->work);
>  	}
>  
>  	spin_unlock_irqrestore(&host->irq_lock, flags);
> @@ -2056,9 +2057,9 @@ static bool dw_mci_clear_pending_data_complete(struct dw_mci *host)
>  	return true;
>  }
>  
> -static void dw_mci_tasklet_func(struct tasklet_struct *t)
> +static void dw_mci_work_func(struct work_struct *t)
>  {
> -	struct dw_mci *host = from_tasklet(host, t, tasklet);
> +	struct dw_mci *host = from_work(host, t, work);
>  	struct mmc_data	*data;
>  	struct mmc_command *cmd;
>  	struct mmc_request *mrq;
> @@ -2113,7 +2114,7 @@ static void dw_mci_tasklet_func(struct tasklet_struct *t)
>  				 * will waste a bit of time (we already know
>  				 * the command was bad), it can't cause any
>  				 * errors since it's possible it would have
> -				 * taken place anyway if this tasklet got
> +				 * taken place anyway if this work got
>  				 * delayed. Allowing the transfer to take place
>  				 * avoids races and keeps things simple.
>  				 */
> @@ -2706,7 +2707,7 @@ static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
>  	smp_wmb(); /* drain writebuffer */
>  
>  	set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
> -	tasklet_schedule(&host->tasklet);
> +	queue_work(system_bh_wq, &host->work);
>  
>  	dw_mci_start_fault_timer(host);
>  }
> @@ -2774,7 +2775,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>  				set_bit(EVENT_DATA_COMPLETE,
>  					&host->pending_events);
>  
> -			tasklet_schedule(&host->tasklet);
> +			queue_work(system_bh_wq, &host->work);
>  
>  			spin_unlock(&host->irq_lock);
>  		}
> @@ -2793,7 +2794,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>  					dw_mci_read_data_pio(host, true);
>  			}
>  			set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
> -			tasklet_schedule(&host->tasklet);
> +			queue_work(system_bh_wq, &host->work);
>  
>  			spin_unlock(&host->irq_lock);
>  		}
> @@ -3098,7 +3099,7 @@ static void dw_mci_cmd11_timer(struct timer_list *t)
>  
>  	host->cmd_status = SDMMC_INT_RTO;
>  	set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
> -	tasklet_schedule(&host->tasklet);
> +	queue_work(system_bh_wq, &host->work);
>  }
>  
>  static void dw_mci_cto_timer(struct timer_list *t)
> @@ -3144,7 +3145,7 @@ static void dw_mci_cto_timer(struct timer_list *t)
>  		 */
>  		host->cmd_status = SDMMC_INT_RTO;
>  		set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
> -		tasklet_schedule(&host->tasklet);
> +		queue_work(system_bh_wq, &host->work);
>  		break;
>  	default:
>  		dev_warn(host->dev, "Unexpected command timeout, state %d\n",
> @@ -3195,7 +3196,7 @@ static void dw_mci_dto_timer(struct timer_list *t)
>  		host->data_status = SDMMC_INT_DRTO;
>  		set_bit(EVENT_DATA_ERROR, &host->pending_events);
>  		set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
> -		tasklet_schedule(&host->tasklet);
> +		queue_work(system_bh_wq, &host->work);
>  		break;
>  	default:
>  		dev_warn(host->dev, "Unexpected data timeout, state %d\n",
> @@ -3435,7 +3436,7 @@ int dw_mci_probe(struct dw_mci *host)
>  	else
>  		host->fifo_reg = host->regs + DATA_240A_OFFSET;
>  
> -	tasklet_setup(&host->tasklet, dw_mci_tasklet_func);
> +	INIT_WORK(&host->work, dw_mci_work_func);
>  	ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
>  			       host->irq_flags, "dw-mci", host);
>  	if (ret)
> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
> index 4ed81f94f7ca..d17f398a0432 100644
> --- a/drivers/mmc/host/dw_mmc.h
> +++ b/drivers/mmc/host/dw_mmc.h
> @@ -17,6 +17,7 @@
>  #include <linux/fault-inject.h>
>  #include <linux/hrtimer.h>
>  #include <linux/interrupt.h>
> +#include <linux/workqueue.h>
>  
>  enum dw_mci_state {
>  	STATE_IDLE = 0,
> @@ -89,12 +90,12 @@ struct dw_mci_dma_slave {
>   * @stop_cmdr: Value to be loaded into CMDR when the stop command is
>   *	to be sent.
>   * @dir_status: Direction of current transfer.
> - * @tasklet: Tasklet running the request state machine.
> + * @work: Work running the request state machine.
>   * @pending_events: Bitmask of events flagged by the interrupt handler
> - *	to be processed by the tasklet.
> + *	to be processed by the work.
>   * @completed_events: Bitmask of events which the state machine has
>   *	processed.
> - * @state: Tasklet state.
> + * @state: Work state.
>   * @queue: List of slots waiting for access to the controller.
>   * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
>   *	rate and timeout calculations.
> @@ -194,7 +195,7 @@ struct dw_mci {
>  	u32			data_status;
>  	u32			stop_cmdr;
>  	u32			dir_status;
> -	struct tasklet_struct	tasklet;
> +	struct work_struct 	work;
>  	unsigned long		pending_events;
>  	unsigned long		completed_events;
>  	enum dw_mci_state	state;
> diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
> index 088f8ed4fdc4..d85bae7b9cba 100644
> --- a/drivers/mmc/host/omap.c
> +++ b/drivers/mmc/host/omap.c
> @@ -28,6 +28,7 @@
>  #include <linux/slab.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/platform_data/mmc-omap.h>
> +#include <linux/workqueue.h>
>  
>  
>  #define	OMAP_MMC_REG_CMD	0x00
> @@ -105,7 +106,7 @@ struct mmc_omap_slot {
>  	u16			power_mode;
>  	unsigned int		fclk_freq;
>  
> -	struct tasklet_struct	cover_tasklet;
> +	struct work_struct 	cover_work;
>  	struct timer_list       cover_timer;
>  	unsigned		cover_open;
>  
> @@ -873,18 +874,18 @@ void omap_mmc_notify_cover_event(struct device *dev, int num, int is_closed)
>  		sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
>  	}
>  
> -	tasklet_hi_schedule(&slot->cover_tasklet);
> +	queue_work(system_bh_highpri_wq, &slot->cover_work);
>  }
>  
>  static void mmc_omap_cover_timer(struct timer_list *t)
>  {
>  	struct mmc_omap_slot *slot = from_timer(slot, t, cover_timer);
> -	tasklet_schedule(&slot->cover_tasklet);
> +	queue_work(system_bh_wq, &slot->cover_work);
>  }
>  
> -static void mmc_omap_cover_handler(struct tasklet_struct *t)
> +static void mmc_omap_cover_handler(struct work_struct *t)
>  {
> -	struct mmc_omap_slot *slot = from_tasklet(slot, t, cover_tasklet);
> +	struct mmc_omap_slot *slot = from_work(slot, t, cover_work);
>  	int cover_open = mmc_omap_cover_is_open(slot);
>  
>  	mmc_detect_change(slot->mmc, 0);
> @@ -1299,7 +1300,7 @@ static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
>  
>  	if (slot->pdata->get_cover_state != NULL) {
>  		timer_setup(&slot->cover_timer, mmc_omap_cover_timer, 0);
> -		tasklet_setup(&slot->cover_tasklet, mmc_omap_cover_handler);
> +		INIT_WORK(&slot->cover_work, mmc_omap_cover_handler);
>  	}
>  
>  	r = mmc_add_host(mmc);
> @@ -1318,7 +1319,7 @@ static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
>  					&dev_attr_cover_switch);
>  		if (r < 0)
>  			goto err_remove_slot_name;
> -		tasklet_schedule(&slot->cover_tasklet);
> +		queue_work(system_bh_wq, &slot->cover_work);
>  	}
>  
>  	return 0;
> @@ -1341,7 +1342,7 @@ static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
>  	if (slot->pdata->get_cover_state != NULL)
>  		device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
>  
> -	tasklet_kill(&slot->cover_tasklet);
> +	cancel_work_sync(&slot->cover_work);
>  	del_timer_sync(&slot->cover_timer);
>  	flush_workqueue(slot->host->mmc_omap_wq);
>  
> diff --git a/drivers/mmc/host/renesas_sdhi.h b/drivers/mmc/host/renesas_sdhi.h
> index 586f94d4dbfd..4fd2bfcacd76 100644
> --- a/drivers/mmc/host/renesas_sdhi.h
> +++ b/drivers/mmc/host/renesas_sdhi.h
> @@ -11,6 +11,7 @@
>  
>  #include <linux/dmaengine.h>
>  #include <linux/platform_device.h>
> +#include <linux/workqueue.h>
>  #include "tmio_mmc.h"
>  
>  struct renesas_sdhi_scc {
> @@ -67,7 +68,7 @@ struct renesas_sdhi_dma {
>  	dma_filter_fn filter;
>  	void (*enable)(struct tmio_mmc_host *host, bool enable);
>  	struct completion dma_dataend;
> -	struct tasklet_struct dma_complete;
> +	struct work_struct dma_complete;
>  };
>  
>  struct renesas_sdhi {
> diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> index 53d34c3eddce..f175f8898516 100644
> --- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> +++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> @@ -336,7 +336,7 @@ static bool renesas_sdhi_internal_dmac_dma_irq(struct tmio_mmc_host *host)
>  		writel(status ^ dma_irqs, host->ctl + DM_CM_INFO1);
>  		set_bit(SDHI_DMA_END_FLAG_DMA, &dma_priv->end_flags);
>  		if (test_bit(SDHI_DMA_END_FLAG_ACCESS, &dma_priv->end_flags))
> -			tasklet_schedule(&dma_priv->dma_complete);
> +			queue_work(system_bh_wq, &dma_priv->dma_complete);
>  	}
>  
>  	return status & dma_irqs;
> @@ -351,7 +351,7 @@ renesas_sdhi_internal_dmac_dataend_dma(struct tmio_mmc_host *host)
>  	set_bit(SDHI_DMA_END_FLAG_ACCESS, &dma_priv->end_flags);
>  	if (test_bit(SDHI_DMA_END_FLAG_DMA, &dma_priv->end_flags) ||
>  	    host->data->error)
> -		tasklet_schedule(&dma_priv->dma_complete);
> +		queue_work(system_bh_wq, &dma_priv->dma_complete);
>  }
>  
>  /*
> @@ -439,9 +439,9 @@ renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host,
>  	renesas_sdhi_internal_dmac_enable_dma(host, false);
>  }
>  
> -static void renesas_sdhi_internal_dmac_issue_tasklet_fn(unsigned long arg)
> +static void renesas_sdhi_internal_dmac_issue_work_fn(struct work_struct *t)
>  {
> -	struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
> +	struct tmio_mmc_host *host = from_work(host, t, dma_issue);
>  	struct renesas_sdhi *priv = host_to_priv(host);
>  
>  	tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
> @@ -453,7 +453,7 @@ static void renesas_sdhi_internal_dmac_issue_tasklet_fn(unsigned long arg)
>  		/* on CMD errors, simulate DMA end immediately */
>  		set_bit(SDHI_DMA_END_FLAG_DMA, &priv->dma_priv.end_flags);
>  		if (test_bit(SDHI_DMA_END_FLAG_ACCESS, &priv->dma_priv.end_flags))
> -			tasklet_schedule(&priv->dma_priv.dma_complete);
> +			queue_work(system_bh_wq, &priv->dma_priv.dma_complete);
>  	}
>  }
>  
> @@ -483,9 +483,9 @@ static bool renesas_sdhi_internal_dmac_complete(struct tmio_mmc_host *host)
>  	return true;
>  }
>  
> -static void renesas_sdhi_internal_dmac_complete_tasklet_fn(unsigned long arg)
> +static void renesas_sdhi_internal_dmac_complete_work_fn(struct work_struct *t)
>  {
> -	struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
> +	struct tmio_mmc_host *host = from_work(host, t, dam_complete);
That doesn't compile, even if I fix the typo to dma_complete.
I have something that does compile, but don't have the platform to test it.

>  
>  	spin_lock_irq(&host->lock);
>  	if (!renesas_sdhi_internal_dmac_complete(host))
> @@ -543,12 +543,10 @@ renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host *host,
>  	/* Each value is set to non-zero to assume "enabling" each DMA */
>  	host->chan_rx = host->chan_tx = (void *)0xdeadbeaf;
>  
> -	tasklet_init(&priv->dma_priv.dma_complete,
> -		     renesas_sdhi_internal_dmac_complete_tasklet_fn,
> -		     (unsigned long)host);
> -	tasklet_init(&host->dma_issue,
> -		     renesas_sdhi_internal_dmac_issue_tasklet_fn,
> -		     (unsigned long)host);
> +	INIT_WORK(&priv->dma_priv.dma_complete,
> +			renesas_sdhi_internal_dmac_complete_work_fn);
> +	INIT_WORK(&host->dma_issue,
> +			renesas_sdhi_internal_dmac_issue_work_fn);
>  
>  	/* Add pre_req and post_req */
>  	host->ops.pre_req = renesas_sdhi_internal_dmac_pre_req;
> diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> index 9cf7f9feab72..793595ad6d02 100644
> --- a/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> +++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> @@ -312,9 +312,9 @@ static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host,
>  	}
>  }
>  
> -static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv)
> +static void renesas_sdhi_sys_dmac_issue_work_fn(struct work_struct *t)
>  {
> -	struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
> +	struct tmio_mmc_host *host = from_work(host, t, dma_issue);
>  	struct dma_chan *chan = NULL;
>  
>  	spin_lock_irq(&host->lock);
> @@ -401,9 +401,8 @@ static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
>  			goto ebouncebuf;
>  
>  		init_completion(&priv->dma_priv.dma_dataend);
> -		tasklet_init(&host->dma_issue,
> -			     renesas_sdhi_sys_dmac_issue_tasklet_fn,
> -			     (unsigned long)host);
> +		INIT_WORK(&host->dma_issue,
> +				renesas_sdhi_sys_dmac_issue_work_fn);
>  	}
>  
>  	renesas_sdhi_sys_dmac_enable_dma(host, true);
> diff --git a/drivers/mmc/host/sdhci-bcm-kona.c b/drivers/mmc/host/sdhci-bcm-kona.c
> index cb9152c6a65d..974f205d479b 100644
> --- a/drivers/mmc/host/sdhci-bcm-kona.c
> +++ b/drivers/mmc/host/sdhci-bcm-kona.c
> @@ -107,7 +107,7 @@ static void sdhci_bcm_kona_sd_init(struct sdhci_host *host)
>   * Software emulation of the SD card insertion/removal. Set insert=1 for insert
>   * and insert=0 for removal. The card detection is done by GPIO. For Broadcom
>   * IP to function properly the bit 0 of CORESTAT register needs to be set/reset
> - * to generate the CD IRQ handled in sdhci.c which schedules card_tasklet.
> + * to generate the CD IRQ handled in sdhci.c which schedules card_work.
>   */
>  static int sdhci_bcm_kona_sd_card_emulate(struct sdhci_host *host, int insert)
>  {
> diff --git a/drivers/mmc/host/tifm_sd.c b/drivers/mmc/host/tifm_sd.c
> index b5a2f2f25ad9..c6285c577db0 100644
> --- a/drivers/mmc/host/tifm_sd.c
> +++ b/drivers/mmc/host/tifm_sd.c
> @@ -13,6 +13,7 @@
>  #include <linux/highmem.h>
>  #include <linux/scatterlist.h>
>  #include <linux/module.h>
> +#include <linux/workqueue.h>
>  #include <asm/io.h>
>  
>  #define DRIVER_NAME "tifm_sd"
> @@ -97,7 +98,7 @@ struct tifm_sd {
>  	unsigned int          clk_div;
>  	unsigned long         timeout_jiffies;
>  
> -	struct tasklet_struct finish_tasklet;
> +	struct work_struct finish_work;
>  	struct timer_list     timer;
>  	struct mmc_request    *req;
>  
> @@ -463,7 +464,7 @@ static void tifm_sd_check_status(struct tifm_sd *host)
>  		}
>  	}
>  finish_request:
> -	tasklet_schedule(&host->finish_tasklet);
> +	queue_work(system_bh_wq, &host->finish_work);
>  }
>  
>  /* Called from interrupt handler */
> @@ -723,9 +724,9 @@ static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  	mmc_request_done(mmc, mrq);
>  }
>  
> -static void tifm_sd_end_cmd(struct tasklet_struct *t)
> +static void tifm_sd_end_cmd(struct work_struct *t)
>  {
> -	struct tifm_sd *host = from_tasklet(host, t, finish_tasklet);
> +	struct tifm_sd *host = from_work(host, t, finish_work);
>  	struct tifm_dev *sock = host->dev;
>  	struct mmc_host *mmc = tifm_get_drvdata(sock);
>  	struct mmc_request *mrq;
> @@ -960,7 +961,7 @@ static int tifm_sd_probe(struct tifm_dev *sock)
>  	 */
>  	mmc->max_busy_timeout = TIFM_MMCSD_REQ_TIMEOUT_MS;
>  
> -	tasklet_setup(&host->finish_tasklet, tifm_sd_end_cmd);
> +	INIT_WORK(&host->finish_work, tifm_sd_end_cmd);
>  	timer_setup(&host->timer, tifm_sd_abort, 0);
>  
>  	mmc->ops = &tifm_sd_ops;
> @@ -999,7 +1000,7 @@ static void tifm_sd_remove(struct tifm_dev *sock)
>  	writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
>  	spin_unlock_irqrestore(&sock->lock, flags);
>  
> -	tasklet_kill(&host->finish_tasklet);
> +	cancel_work_sync(&host->finish_work);
>  
>  	spin_lock_irqsave(&sock->lock, flags);
>  	if (host->req) {
> @@ -1009,7 +1010,7 @@ static void tifm_sd_remove(struct tifm_dev *sock)
>  		host->req->cmd->error = -ENOMEDIUM;
>  		if (host->req->stop)
>  			host->req->stop->error = -ENOMEDIUM;
> -		tasklet_schedule(&host->finish_tasklet);
> +		queue_work(system_bh_wq, &host->finish_work);
>  	}
>  	spin_unlock_irqrestore(&sock->lock, flags);
>  	mmc_remove_host(mmc);
> diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
> index de56e6534aea..bee13acaa80f 100644
> --- a/drivers/mmc/host/tmio_mmc.h
> +++ b/drivers/mmc/host/tmio_mmc.h
> @@ -21,6 +21,7 @@
>  #include <linux/scatterlist.h>
>  #include <linux/spinlock.h>
>  #include <linux/interrupt.h>
> +#include <linux/workqueue.h>
>  
>  #define CTL_SD_CMD 0x00
>  #define CTL_ARG_REG 0x04
> @@ -156,7 +157,7 @@ struct tmio_mmc_host {
>  	bool			dma_on;
>  	struct dma_chan		*chan_rx;
>  	struct dma_chan		*chan_tx;
> -	struct tasklet_struct	dma_issue;
> +	struct work_struct 	dma_issue;
>  	struct scatterlist	bounce_sg;
>  	u8			*bounce_buf;
>  
> diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
> index 93e912afd3ae..51bd2365795b 100644
> --- a/drivers/mmc/host/tmio_mmc_core.c
> +++ b/drivers/mmc/host/tmio_mmc_core.c
> @@ -608,7 +608,7 @@ static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat)
>  			} else {
>  				tmio_mmc_disable_mmc_irqs(host,
>  							  TMIO_MASK_READOP);
> -				tasklet_schedule(&host->dma_issue);
> +				queue_work(system_bh_wq, &host->dma_issue);
>  			}
>  		} else {
>  			if (!host->dma_on) {
> @@ -616,7 +616,7 @@ static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat)
>  			} else {
>  				tmio_mmc_disable_mmc_irqs(host,
>  							  TMIO_MASK_WRITEOP);
> -				tasklet_schedule(&host->dma_issue);
> +				queue_work(system_bh_wq, &host->dma_issue);
>  			}
>  		}
>  	} else {
> diff --git a/drivers/mmc/host/uniphier-sd.c b/drivers/mmc/host/uniphier-sd.c
> index 1404989e6151..d1964111c393 100644
> --- a/drivers/mmc/host/uniphier-sd.c
> +++ b/drivers/mmc/host/uniphier-sd.c
> @@ -17,6 +17,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
>  #include <linux/reset.h>
> +#include <linux/workqueue.h>
>  
>  #include "tmio_mmc.h"
>  
> @@ -90,9 +91,9 @@ static void uniphier_sd_dma_endisable(struct tmio_mmc_host *host, int enable)
>  }
>  
>  /* external DMA engine */
> -static void uniphier_sd_external_dma_issue(struct tasklet_struct *t)
> +static void uniphier_sd_external_dma_issue(struct work_struct *t)
>  {
> -	struct tmio_mmc_host *host = from_tasklet(host, t, dma_issue);
> +	struct tmio_mmc_host *host = from_work(host, t, dma_issue);
>  	struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
>  
>  	uniphier_sd_dma_endisable(host, 1);
> @@ -199,7 +200,7 @@ static void uniphier_sd_external_dma_request(struct tmio_mmc_host *host,
>  	host->chan_rx = chan;
>  	host->chan_tx = chan;
>  
> -	tasklet_setup(&host->dma_issue, uniphier_sd_external_dma_issue);
> +	INIT_WORK(&host->dma_issue, uniphier_sd_external_dma_issue);
>  }
>  
>  static void uniphier_sd_external_dma_release(struct tmio_mmc_host *host)
> @@ -236,9 +237,9 @@ static const struct tmio_mmc_dma_ops uniphier_sd_external_dma_ops = {
>  	.dataend = uniphier_sd_external_dma_dataend,
>  };
>  
> -static void uniphier_sd_internal_dma_issue(struct tasklet_struct *t)
> +static void uniphier_sd_internal_dma_issue(struct work_struct *t)
>  {
> -	struct tmio_mmc_host *host = from_tasklet(host, t, dma_issue);
> +	struct tmio_mmc_host *host = from_work(host, t, dma_issue);
>  	unsigned long flags;
>  
>  	spin_lock_irqsave(&host->lock, flags);
> @@ -317,7 +318,7 @@ static void uniphier_sd_internal_dma_request(struct tmio_mmc_host *host,
>  
>  	host->chan_tx = (void *)0xdeadbeaf;
>  
> -	tasklet_setup(&host->dma_issue, uniphier_sd_internal_dma_issue);
> +	INIT_WORK(&host->dma_issue, uniphier_sd_internal_dma_issue);
>  }
>  
>  static void uniphier_sd_internal_dma_release(struct tmio_mmc_host *host)
> diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c
> index ba6044b16e07..2777b773086b 100644
> --- a/drivers/mmc/host/via-sdmmc.c
> +++ b/drivers/mmc/host/via-sdmmc.c
> @@ -12,6 +12,7 @@
>  #include <linux/interrupt.h>
>  
>  #include <linux/mmc/host.h>
> +#include <linux/workqueue.h>
>  
>  #define DRV_NAME	"via_sdmmc"
>  
> @@ -307,7 +308,7 @@ struct via_crdr_mmc_host {
>  	struct sdhcreg pm_sdhc_reg;
>  
>  	struct work_struct carddet_work;
> -	struct tasklet_struct finish_tasklet;
> +	struct work_struct finish_work;
>  
>  	struct timer_list timer;
>  	spinlock_t lock;
> @@ -643,7 +644,7 @@ static void via_sdc_finish_data(struct via_crdr_mmc_host *host)
>  	if (data->stop)
>  		via_sdc_send_command(host, data->stop);
>  	else
> -		tasklet_schedule(&host->finish_tasklet);
> +		queue_work(system_bh_wq, &host->finish_work);
>  }
>  
>  static void via_sdc_finish_command(struct via_crdr_mmc_host *host)
> @@ -653,7 +654,7 @@ static void via_sdc_finish_command(struct via_crdr_mmc_host *host)
>  	host->cmd->error = 0;
>  
>  	if (!host->cmd->data)
> -		tasklet_schedule(&host->finish_tasklet);
> +		queue_work(system_bh_wq, &host->finish_work);
>  
>  	host->cmd = NULL;
>  }
> @@ -682,7 +683,7 @@ static void via_sdc_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  	status = readw(host->sdhc_mmiobase + VIA_CRDR_SDSTATUS);
>  	if (!(status & VIA_CRDR_SDSTS_SLOTG) || host->reject) {
>  		host->mrq->cmd->error = -ENOMEDIUM;
> -		tasklet_schedule(&host->finish_tasklet);
> +		queue_work(system_bh_wq, &host->finish_work);
>  	} else {
>  		via_sdc_send_command(host, mrq->cmd);
>  	}
> @@ -848,7 +849,7 @@ static void via_sdc_cmd_isr(struct via_crdr_mmc_host *host, u16 intmask)
>  		host->cmd->error = -EILSEQ;
>  
>  	if (host->cmd->error)
> -		tasklet_schedule(&host->finish_tasklet);
> +		queue_work(system_bh_wq, &host->finish_work);
>  	else if (intmask & VIA_CRDR_SDSTS_CRD)
>  		via_sdc_finish_command(host);
>  }
> @@ -955,16 +956,16 @@ static void via_sdc_timeout(struct timer_list *t)
>  				sdhost->cmd->error = -ETIMEDOUT;
>  			else
>  				sdhost->mrq->cmd->error = -ETIMEDOUT;
> -			tasklet_schedule(&sdhost->finish_tasklet);
> +			queue_work(system_bh_wq, &sdhost->finish_work);
>  		}
>  	}
>  
>  	spin_unlock_irqrestore(&sdhost->lock, flags);
>  }
>  
> -static void via_sdc_tasklet_finish(struct tasklet_struct *t)
> +static void via_sdc_work_finish(struct work_struct *t)
>  {
> -	struct via_crdr_mmc_host *host = from_tasklet(host, t, finish_tasklet);
> +	struct via_crdr_mmc_host *host = from_work(host, t, finish_work);
>  	unsigned long flags;
>  	struct mmc_request *mrq;
>  
> @@ -1005,7 +1006,7 @@ static void via_sdc_card_detect(struct work_struct *work)
>  			pr_err("%s: Card removed during transfer!\n",
>  			       mmc_hostname(host->mmc));
>  			host->mrq->cmd->error = -ENOMEDIUM;
> -			tasklet_schedule(&host->finish_tasklet);
> +			queue_work(system_bh_wq, &host->finish_work);
>  		}
>  
>  		spin_unlock_irqrestore(&host->lock, flags);
> @@ -1051,7 +1052,7 @@ static void via_init_mmc_host(struct via_crdr_mmc_host *host)
>  
>  	INIT_WORK(&host->carddet_work, via_sdc_card_detect);
>  
> -	tasklet_setup(&host->finish_tasklet, via_sdc_tasklet_finish);
> +	INIT_WORK(&host->finish_work, via_sdc_work_finish);
>  
>  	addrbase = host->sdhc_mmiobase;
>  	writel(0x0, addrbase + VIA_CRDR_SDINTMASK);
> @@ -1193,7 +1194,7 @@ static void via_sd_remove(struct pci_dev *pcidev)
>  		sdhost->mrq->cmd->error = -ENOMEDIUM;
>  		if (sdhost->mrq->stop)
>  			sdhost->mrq->stop->error = -ENOMEDIUM;
> -		tasklet_schedule(&sdhost->finish_tasklet);
> +		queue_work(system_bh_wq, &sdhost->finish_work);
>  	}
>  	spin_unlock_irqrestore(&sdhost->lock, flags);
>  
> @@ -1203,7 +1204,7 @@ static void via_sd_remove(struct pci_dev *pcidev)
>  
>  	del_timer_sync(&sdhost->timer);
>  
> -	tasklet_kill(&sdhost->finish_tasklet);
> +	cancel_work_sync(&sdhost->finish_work);
>  
>  	/* switch off power */
>  	gatt = readb(sdhost->pcictrl_mmiobase + VIA_CRDR_PCICLKGATT);
> diff --git a/drivers/mmc/host/wbsd.c b/drivers/mmc/host/wbsd.c
> index f0562f712d98..984e380abc71 100644
> --- a/drivers/mmc/host/wbsd.c
> +++ b/drivers/mmc/host/wbsd.c
> @@ -32,6 +32,7 @@
>  #include <linux/mmc/sd.h>
>  #include <linux/scatterlist.h>
>  #include <linux/slab.h>
> +#include <linux/workqueue.h>
>  
>  #include <asm/io.h>
>  #include <asm/dma.h>
> @@ -459,7 +460,7 @@ static void wbsd_empty_fifo(struct wbsd_host *host)
>  	 * FIFO threshold interrupts properly.
>  	 */
>  	if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
> -		tasklet_schedule(&host->fifo_tasklet);
> +		queue_work(system_bh_wq, &host->fifo_work);
>  }
>  
>  static void wbsd_fill_fifo(struct wbsd_host *host)
> @@ -524,7 +525,7 @@ static void wbsd_fill_fifo(struct wbsd_host *host)
>  	 * 'FIFO empty' under certain conditions. So we
>  	 * need to be a bit more pro-active.
>  	 */
> -	tasklet_schedule(&host->fifo_tasklet);
> +	queue_work(system_bh_wq, &host->fifo_work);
>  }
>  
>  static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
> @@ -746,7 +747,7 @@ static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  	struct mmc_command *cmd;
>  
>  	/*
> -	 * Disable tasklets to avoid a deadlock.
> +	 * Disable works to avoid a deadlock.
>  	 */
>  	spin_lock_bh(&host->lock);
>  
> @@ -821,7 +822,7 @@ static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  		 * Dirty fix for hardware bug.
>  		 */
>  		if (host->dma == -1)
> -			tasklet_schedule(&host->fifo_tasklet);
> +			queue_work(system_bh_wq, &host->fifo_work);
>  
>  		spin_unlock_bh(&host->lock);
>  
> @@ -961,13 +962,13 @@ static void wbsd_reset_ignore(struct timer_list *t)
>  	 * Card status might have changed during the
>  	 * blackout.
>  	 */
> -	tasklet_schedule(&host->card_tasklet);
> +	queue_work(system_bh_wq, &host->card_work);
>  
>  	spin_unlock_bh(&host->lock);
>  }
>  
>  /*
> - * Tasklets
> + * Works
>   */
>  
>  static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
> @@ -987,9 +988,9 @@ static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
>  	return host->mrq->cmd->data;
>  }
>  
> -static void wbsd_tasklet_card(struct tasklet_struct *t)
> +static void wbsd_work_card(struct work_struct *t)
>  {
> -	struct wbsd_host *host = from_tasklet(host, t, card_tasklet);
> +	struct wbsd_host *host = from_work(host, t, card_work);
>  	u8 csr;
>  	int delay = -1;
>  
> @@ -1020,7 +1021,7 @@ static void wbsd_tasklet_card(struct tasklet_struct *t)
>  			wbsd_reset(host);
>  
>  			host->mrq->cmd->error = -ENOMEDIUM;
> -			tasklet_schedule(&host->finish_tasklet);
> +			queue_work(system_bh_wq, &host->finish_work);
>  		}
>  
>  		delay = 0;
> @@ -1036,9 +1037,9 @@ static void wbsd_tasklet_card(struct tasklet_struct *t)
>  		mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
>  }
>  
> -static void wbsd_tasklet_fifo(struct tasklet_struct *t)
> +static void wbsd_work_fifo(struct work_struct *t)
>  {
> -	struct wbsd_host *host = from_tasklet(host, t, fifo_tasklet);
> +	struct wbsd_host *host = from_work(host, t, fifo_work);
>  	struct mmc_data *data;
>  
>  	spin_lock(&host->lock);
> @@ -1060,16 +1061,16 @@ static void wbsd_tasklet_fifo(struct tasklet_struct *t)
>  	 */
>  	if (host->num_sg == 0) {
>  		wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
> -		tasklet_schedule(&host->finish_tasklet);
> +		queue_work(system_bh_wq, &host->finish_work);
>  	}
>  
>  end:
>  	spin_unlock(&host->lock);
>  }
>  
> -static void wbsd_tasklet_crc(struct tasklet_struct *t)
> +static void wbsd_work_crc(struct work_struct *t)
>  {
> -	struct wbsd_host *host = from_tasklet(host, t, crc_tasklet);
> +	struct wbsd_host *host = from_work(host, t, crc_work);
>  	struct mmc_data *data;
>  
>  	spin_lock(&host->lock);
> @@ -1085,15 +1086,15 @@ static void wbsd_tasklet_crc(struct tasklet_struct *t)
>  
>  	data->error = -EILSEQ;
>  
> -	tasklet_schedule(&host->finish_tasklet);
> +	queue_work(system_bh_wq, &host->finish_work);
>  
>  end:
>  	spin_unlock(&host->lock);
>  }
>  
> -static void wbsd_tasklet_timeout(struct tasklet_struct *t)
> +static void wbsd_work_timeout(struct work_struct *t)
>  {
> -	struct wbsd_host *host = from_tasklet(host, t, timeout_tasklet);
> +	struct wbsd_host *host = from_work(host, t, timeout_work);
>  	struct mmc_data *data;
>  
>  	spin_lock(&host->lock);
> @@ -1109,15 +1110,15 @@ static void wbsd_tasklet_timeout(struct tasklet_struct *t)
>  
>  	data->error = -ETIMEDOUT;
>  
> -	tasklet_schedule(&host->finish_tasklet);
> +	queue_work(system_bh_wq, &host->finish_work);
>  
>  end:
>  	spin_unlock(&host->lock);
>  }
>  
> -static void wbsd_tasklet_finish(struct tasklet_struct *t)
> +static void wbsd_work_finish(struct work_struct *t)
>  {
> -	struct wbsd_host *host = from_tasklet(host, t, finish_tasklet);
> +	struct wbsd_host *host = from_work(host, t, finish_work);
>  	struct mmc_data *data;
>  
>  	spin_lock(&host->lock);
> @@ -1156,18 +1157,18 @@ static irqreturn_t wbsd_irq(int irq, void *dev_id)
>  	host->isr |= isr;
>  
>  	/*
> -	 * Schedule tasklets as needed.
> +	 * Schedule works as needed.
>  	 */
>  	if (isr & WBSD_INT_CARD)
> -		tasklet_schedule(&host->card_tasklet);
> +		queue_work(system_bh_wq, &host->card_work);
>  	if (isr & WBSD_INT_FIFO_THRE)
> -		tasklet_schedule(&host->fifo_tasklet);
> +		queue_work(system_bh_wq, &host->fifo_work);
>  	if (isr & WBSD_INT_CRC)
> -		tasklet_hi_schedule(&host->crc_tasklet);
> +		queue_work(system_bh_highpri_wq, &host->crc_work);
>  	if (isr & WBSD_INT_TIMEOUT)
> -		tasklet_hi_schedule(&host->timeout_tasklet);
> +		queue_work(system_bh_highpri_wq, &host->timeout_work);
>  	if (isr & WBSD_INT_TC)
> -		tasklet_schedule(&host->finish_tasklet);
> +		queue_work(system_bh_wq, &host->finish_work);
>  
>  	return IRQ_HANDLED;
>  }
> @@ -1443,13 +1444,13 @@ static int wbsd_request_irq(struct wbsd_host *host, int irq)
>  	int ret;
>  
>  	/*
> -	 * Set up tasklets. Must be done before requesting interrupt.
> +	 * Set up works. Must be done before requesting interrupt.
>  	 */
> -	tasklet_setup(&host->card_tasklet, wbsd_tasklet_card);
> -	tasklet_setup(&host->fifo_tasklet, wbsd_tasklet_fifo);
> -	tasklet_setup(&host->crc_tasklet, wbsd_tasklet_crc);
> -	tasklet_setup(&host->timeout_tasklet, wbsd_tasklet_timeout);
> -	tasklet_setup(&host->finish_tasklet, wbsd_tasklet_finish);
> +	INIT_WORK(&host->card_work, wbsd_work_card);
> +	INIT_WORK(&host->fifo_work, wbsd_work_fifo);
> +	INIT_WORK(&host->crc_work, wbsd_work_crc);
> +	INIT_WORK(&host->timeout_work, wbsd_work_timeout);
> +	INIT_WORK(&host->finish_work, wbsd_work_finish);
>  
>  	/*
>  	 * Allocate interrupt.
> @@ -1472,11 +1473,11 @@ static void  wbsd_release_irq(struct wbsd_host *host)
>  
>  	host->irq = 0;
>  
> -	tasklet_kill(&host->card_tasklet);
> -	tasklet_kill(&host->fifo_tasklet);
> -	tasklet_kill(&host->crc_tasklet);
> -	tasklet_kill(&host->timeout_tasklet);
> -	tasklet_kill(&host->finish_tasklet);
> +	cancel_work_sync(&host->card_work);
> +	cancel_work_sync(&host->fifo_work);
> +	cancel_work_sync(&host->crc_work);
> +	cancel_work_sync(&host->timeout_work);
> +	cancel_work_sync(&host->finish_work);
>  }
>  
>  /*
> diff --git a/drivers/mmc/host/wbsd.h b/drivers/mmc/host/wbsd.h
> index be30b4d8ce4c..942a64a724e4 100644
> --- a/drivers/mmc/host/wbsd.h
> +++ b/drivers/mmc/host/wbsd.h
> @@ -171,11 +171,11 @@ struct wbsd_host
>  	int			irq;		/* Interrupt */
>  	int			dma;		/* DMA channel */
>  
> -	struct tasklet_struct	card_tasklet;	/* Tasklet structures */
> -	struct tasklet_struct	fifo_tasklet;
> -	struct tasklet_struct	crc_tasklet;
> -	struct tasklet_struct	timeout_tasklet;
> -	struct tasklet_struct	finish_tasklet;
> +	struct work_struct 	card_work;	/* Work structures */
> +	struct work_struct 	fifo_work;
> +	struct work_struct 	crc_work;
> +	struct work_struct 	timeout_work;
> +	struct work_struct 	finish_work;
>  
>  	struct timer_list	ignore_timer;	/* Ignore detection timer */
>  };