Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756805Ab0DVTlg (ORCPT ); Thu, 22 Apr 2010 15:41:36 -0400 Received: from kroah.org ([198.145.64.141]:41368 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756773Ab0DVT32 (ORCPT ); Thu, 22 Apr 2010 15:29:28 -0400 X-Mailbox-Line: From gregkh@kvm.kroah.org Thu Apr 22 12:09:20 2010 Message-Id: <20100422190920.561166562@kvm.kroah.org> User-Agent: quilt/0.48-4.4 Date: Thu, 22 Apr 2010 12:09:59 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Larry Finger , maximilian attems , "John W. Linville" Subject: [148/197] b43: Allow PIO mode to be selected at module load In-Reply-To: <20100422191857.GA13268@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6967 Lines: 229 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ From: Larry Finger commit b02914af4d7020828ce921a572589dd793517c09 upstream. If userencounter the "Fatal DMA Problem" with a BCM43XX device, and still wish to use b43 as the driver, their only option is to rebuild the kernel with CONFIG_B43_FORCE_PIO. This patch removes this option and allows PIO mode to be selected with a load-time parameter for the module. Note that the configuration variable CONFIG_B43_PIO is also removed. Once the DMA problem with the BCM4312 devices is solved, this patch will likely be reverted. Signed-off-by: Larry Finger Tested-by: John Daiker Cc: maximilian attems Signed-off-by: John W. Linville Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/b43/Kconfig | 19 +----------------- drivers/net/wireless/b43/Makefile | 2 - drivers/net/wireless/b43/b43.h | 13 ------------ drivers/net/wireless/b43/dma.c | 2 - drivers/net/wireless/b43/main.c | 9 +++++--- drivers/net/wireless/b43/pio.h | 40 -------------------------------------- 6 files changed, 9 insertions(+), 76 deletions(-) --- a/drivers/net/wireless/b43/Kconfig +++ b/drivers/net/wireless/b43/Kconfig @@ -3,6 +3,7 @@ config B43 depends on SSB_POSSIBLE && MAC80211 && WLAN_80211 && HAS_DMA select SSB select FW_LOADER + select SSB_BLOCKIO ---help--- b43 is a driver for the Broadcom 43xx series wireless devices. @@ -78,14 +79,6 @@ config B43_SDIO If unsure, say N. -# Data transfers to the device via PIO -# This is only needed on PCMCIA and SDIO devices. All others can do DMA properly. -config B43_PIO - bool - depends on B43 && (B43_SDIO || B43_PCMCIA || B43_FORCE_PIO) - select SSB_BLOCKIO - default y - config B43_NPHY bool "Pre IEEE 802.11n support (BROKEN)" depends on B43 && EXPERIMENTAL && BROKEN @@ -137,12 +130,4 @@ config B43_DEBUG for production use. Only say Y, if you are debugging a problem in the b43 driver sourcecode. -config B43_FORCE_PIO - bool "Force usage of PIO instead of DMA" - depends on B43 && B43_DEBUG - ---help--- - This will disable DMA and always enable PIO instead. - - Say N! - This is only for debugging the PIO engine code. You do - _NOT_ want to enable this. + --- a/drivers/net/wireless/b43/Makefile +++ b/drivers/net/wireless/b43/Makefile @@ -12,7 +12,7 @@ b43-y += xmit.o b43-y += lo.o b43-y += wa.o b43-y += dma.o -b43-$(CONFIG_B43_PIO) += pio.o +b43-y += pio.o b43-y += rfkill.o b43-$(CONFIG_B43_LEDS) += leds.o b43-$(CONFIG_B43_PCMCIA) += pcmcia.o --- a/drivers/net/wireless/b43/b43.h +++ b/drivers/net/wireless/b43/b43.h @@ -830,7 +830,6 @@ struct b43_wl { /* The device LEDs. */ struct b43_leds leds; -#ifdef CONFIG_B43_PIO /* * RX/TX header/tail buffers used by the frame transmit functions. */ @@ -838,7 +837,6 @@ struct b43_wl { struct b43_txhdr txhdr; u8 rx_tail[4]; u8 tx_tail[4]; -#endif /* CONFIG_B43_PIO */ }; static inline struct b43_wl *hw_to_b43_wl(struct ieee80211_hw *hw) @@ -889,20 +887,9 @@ static inline void b43_write32(struct b4 static inline bool b43_using_pio_transfers(struct b43_wldev *dev) { -#ifdef CONFIG_B43_PIO return dev->__using_pio_transfers; -#else - return 0; -#endif } -#ifdef CONFIG_B43_FORCE_PIO -# define B43_FORCE_PIO 1 -#else -# define B43_FORCE_PIO 0 -#endif - - /* Message printing */ void b43info(struct b43_wl *wl, const char *fmt, ...) __attribute__ ((format(printf, 2, 3))); --- a/drivers/net/wireless/b43/dma.c +++ b/drivers/net/wireless/b43/dma.c @@ -1620,7 +1620,6 @@ void b43_dma_tx_resume(struct b43_wldev b43_power_saving_ctl_bits(dev, 0); } -#ifdef CONFIG_B43_PIO static void direct_fifo_rx(struct b43_wldev *dev, enum b43_dmatype type, u16 mmio_base, bool enable) { @@ -1654,4 +1653,3 @@ void b43_dma_direct_fifo_rx(struct b43_w mmio_base = b43_dmacontroller_base(type, engine_index); direct_fifo_rx(dev, type, mmio_base, enable); } -#endif /* CONFIG_B43_PIO */ --- a/drivers/net/wireless/b43/main.c +++ b/drivers/net/wireless/b43/main.c @@ -102,6 +102,9 @@ int b43_modparam_verbose = B43_VERBOSITY module_param_named(verbose, b43_modparam_verbose, int, 0644); MODULE_PARM_DESC(verbose, "Log message verbosity: 0=error, 1=warn, 2=info(default), 3=debug"); +static int modparam_pio; +module_param_named(pio, modparam_pio, int, 0444); +MODULE_PARM_DESC(pio, "enable(1) / disable(0) PIO mode"); static const struct ssb_device_id b43_ssb_tbl[] = { SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 5), @@ -1790,8 +1793,8 @@ static void b43_do_interrupt_thread(stru dma_reason[4], dma_reason[5]); b43err(dev->wl, "This device does not support DMA " "on your system. Please use PIO instead.\n"); - b43err(dev->wl, "CONFIG_B43_FORCE_PIO must be set in " - "your kernel configuration.\n"); + b43err(dev->wl, "Unload the b43 module and reload " + "with 'pio=1'\n"); return; } if (merged_dma_reason & B43_DMAIRQ_NONFATALMASK) { @@ -4358,7 +4361,7 @@ static int b43_wireless_core_init(struct if ((dev->dev->bus->bustype == SSB_BUSTYPE_PCMCIA) || (dev->dev->bus->bustype == SSB_BUSTYPE_SDIO) || - B43_FORCE_PIO) { + modparam_pio) { dev->__using_pio_transfers = 1; err = b43_pio_init(dev); } else { --- a/drivers/net/wireless/b43/pio.h +++ b/drivers/net/wireless/b43/pio.h @@ -55,8 +55,6 @@ #define B43_PIO_MAX_NR_TXPACKETS 32 -#ifdef CONFIG_B43_PIO - struct b43_pio_txpacket { /* Pointer to the TX queue we belong to. */ struct b43_pio_txqueue *queue; @@ -169,42 +167,4 @@ void b43_pio_rx(struct b43_pio_rxqueue * void b43_pio_tx_suspend(struct b43_wldev *dev); void b43_pio_tx_resume(struct b43_wldev *dev); - -#else /* CONFIG_B43_PIO */ - - -static inline int b43_pio_init(struct b43_wldev *dev) -{ - return 0; -} -static inline void b43_pio_free(struct b43_wldev *dev) -{ -} -static inline void b43_pio_stop(struct b43_wldev *dev) -{ -} -static inline int b43_pio_tx(struct b43_wldev *dev, - struct sk_buff *skb) -{ - return 0; -} -static inline void b43_pio_handle_txstatus(struct b43_wldev *dev, - const struct b43_txstatus *status) -{ -} -static inline void b43_pio_get_tx_stats(struct b43_wldev *dev, - struct ieee80211_tx_queue_stats *stats) -{ -} -static inline void b43_pio_rx(struct b43_pio_rxqueue *q) -{ -} -static inline void b43_pio_tx_suspend(struct b43_wldev *dev) -{ -} -static inline void b43_pio_tx_resume(struct b43_wldev *dev) -{ -} - -#endif /* CONFIG_B43_PIO */ #endif /* B43_PIO_H_ */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/