Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH] mmc: alcor: Drop pointer to mmc_host from
 alcor_sdmmc_host
To:     Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>,
        Lukas Wunner <lukas@wunner.de>,
        Ulf Hansson <ulf.hansson@linaro.org>, drake@endlessm.com,
        linux-mmc@vger.kernel.org
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <1556776696-19300-1-git-send-email-kamlesh.gurudasani@gmail.com>
From:   Oleksij Rempel <linux@rempel-privat.de>
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Message-ID: <4b2d860a-3677-f3c3-9269-268559f3653b@rempel-privat.de>
Date:   Thu, 2 May 2019 08:07:59 +0200
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CC: Daniel Drake <drake@endlessm.com>

Am 02.05.19 um 07:58 schrieb Kamlesh Gurudasani:
> The driver for Alcor Micro AU6601 and AU6621 controllers uses a pointer =
to
> get from the private alcor_sdmmc_host structure to the generic mmc_host
> structure. However the latter is always immediately preceding the former=
 in
> memory, so compute its address with a subtraction (which is cheaper than=
 a
> dereference) and drop the superfluous pointer.
>
> No functional change intended.
>
> Signed-off-by: Kamlesh Gurudasani <kamlesh.gurudasani@gmail.com>
> ---
>  drivers/mmc/host/alcor.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mmc/host/alcor.c b/drivers/mmc/host/alcor.c
> index 7c8f203..5bba6ee 100644
> --- a/drivers/mmc/host/alcor.c
> +++ b/drivers/mmc/host/alcor.c
> @@ -43,7 +43,6 @@ struct alcor_sdmmc_host {
>  	struct  device *dev;
>  	struct alcor_pci_priv *alcor_pci;
>
> -	struct mmc_host *mmc;
>  	struct mmc_request *mrq;
>  	struct mmc_command *cmd;
>  	struct mmc_data *data;
> @@ -276,7 +275,7 @@ static void alcor_send_cmd(struct alcor_sdmmc_host *=
host,
>  		break;
>  	default:
>  		dev_err(host->dev, "%s: cmd->flag (0x%02x) is not valid\n",
> -			mmc_hostname(host->mmc), mmc_resp_type(cmd));
> +			mmc_hostname(mmc_from_priv(host)), mmc_resp_type(cmd));
>  		break;
>  	}
>
> @@ -317,7 +316,7 @@ static void alcor_request_complete(struct alcor_sdmm=
c_host *host,
>  	host->data =3D NULL;
>  	host->dma_on =3D 0;
>
> -	mmc_request_done(host->mmc, mrq);
> +	mmc_request_done(mmc_from_priv(host), mrq);
>  }
>
>  static void alcor_finish_data(struct alcor_sdmmc_host *host)
> @@ -547,7 +546,7 @@ static void alcor_cd_irq(struct alcor_sdmmc_host *ho=
st, u32 intmask)
>  		alcor_request_complete(host, 1);
>  	}
>
> -	mmc_detect_change(host->mmc, msecs_to_jiffies(1));
> +	mmc_detect_change(mmc_from_priv(host), msecs_to_jiffies(1));
>  }
>
>  static irqreturn_t alcor_irq_thread(int irq, void *d)
> @@ -1025,7 +1024,7 @@ static void alcor_hw_uninit(struct alcor_sdmmc_hos=
t *host)
>
>  static void alcor_init_mmc(struct alcor_sdmmc_host *host)
>  {
> -	struct mmc_host *mmc =3D host->mmc;
> +	struct mmc_host *mmc =3D mmc_from_priv(host);
>
>  	mmc->f_min =3D AU6601_MIN_CLOCK;
>  	mmc->f_max =3D AU6601_MAX_CLOCK;
> @@ -1073,7 +1072,6 @@ static int alcor_pci_sdmmc_drv_probe(struct platfo=
rm_device *pdev)
>  	}
>
>  	host =3D mmc_priv(mmc);
> -	host->mmc =3D mmc;
>  	host->dev =3D &pdev->dev;
>  	host->cur_power_mode =3D MMC_POWER_UNDEFINED;
>  	host->alcor_pci =3D priv;
> @@ -1105,13 +1103,14 @@ static int alcor_pci_sdmmc_drv_probe(struct plat=
form_device *pdev)
>  static int alcor_pci_sdmmc_drv_remove(struct platform_device *pdev)
>  {
>  	struct alcor_sdmmc_host *host =3D dev_get_drvdata(&pdev->dev);
> +	struct mmc_host *mmc =3D mmc_from_priv(host);
>
>  	if (cancel_delayed_work_sync(&host->timeout_work))
>  		alcor_request_complete(host, 0);
>
>  	alcor_hw_uninit(host);
> -	mmc_remove_host(host->mmc);
> -	mmc_free_host(host->mmc);
> +	mmc_remove_host(mmc);
> +	mmc_free_host(mmc);
>
>  	return 0;
>  }
>


=2D-
Regards,
Oleksij