linux-kernel - Re: [PATCH] mmc: core: sdio: Fix unconditional wake_up

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Message-ID: <CAPDyKFqLE-09=3k_6stMXiY3+Ax3xoRBO3q__GHyqH4fd-XmsQ@mail.gmail.com>
Date:	Tue, 12 Aug 2014 12:23:33 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>,
	Chris Ball <chris@...ntf.net>,
	"tgih.jun@...sung.com" <tgih.jun@...sung.com>,
	Aaron Lu <aaron.lu@...el.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jackey Shen <jackey.shen@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] mmc: core: sdio: Fix unconditional wake_up_process() on
 sdio thread

On 11 August 2014 07:49, Fu, Zhonghui <zhonghui.fu@...ux.intel.com> wrote:
> From 6cee984e1d76ba0a3320430f8cf4318ab65fcf06 Mon Sep 17 00:00:00 2001
> From: Fu Zhonghui <zhonghui.fu@...ux.intel.com>
> Date: Tue, 5 Aug 2014 12:44:38 +0800
> Subject: [PATCH] mmc: core: sdio: Fix unconditional wake_up_process() on sdio thread
>
> 781e989cf59 ("mmc: sdhci: convert to new SDIO IRQ handling") and
> bf3b5ec66bd ("mmc: sdio_irq: rework sdio irq handling") disabled
> the use of our own custom threaded IRQ handler, but left in an
> unconditional wake_up_process() on that handler at resume-time.
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=80151
>
> In addition, the check for MMC_CAP_SDIO_IRQ capability is added
> before enable sdio IRQ.
>
> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
> Signed-off-by: Chris Ball <chris@...ntf.net>
> Signed-off-by: Fu Zhonghui <zhonghui.fu@...ux.intel.com>
> ---
>  drivers/mmc/core/sdio.c     |   14 ++++++++++++--
>  drivers/mmc/core/sdio_irq.c |    4 ++--
>  2 files changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index e636d9e..e04a540 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -992,8 +992,18 @@ static int mmc_sdio_resume(struct mmc_host *host)
>                 }
>         }
>
> -       if (!err && host->sdio_irqs)
> -               wake_up_process(host->sdio_irq_thread);
> +       if (!err && host->sdio_irqs) {
> +               if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
> +                       wake_up_process(host->sdio_irq_thread);
> +               } else if (host->caps & MMC_CAP_SDIO_IRQ) {
> +                       mmc_release_host(host);

Why mmc_release_host() and the corresponding mmc_claim_host() below?
Those shouldn't be needed I think.


> +                       mmc_host_clk_hold(host);
> +                       host->ops->enable_sdio_irq(host, 1);
> +                       mmc_host_clk_release(host);
> +                       mmc_claim_host(host);
> +               }
> +       }
> +
>         mmc_release_host(host);
>
>         host->pm_flags &= ~MMC_PM_KEEP_POWER;
> diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
> index 5cc13c8..696eca4 100644
> --- a/drivers/mmc/core/sdio_irq.c
> +++ b/drivers/mmc/core/sdio_irq.c
> @@ -208,7 +208,7 @@ static int sdio_card_irq_get(struct mmc_card *card)
>                                 host->sdio_irqs--;
>                                 return err;
>                         }
> -               } else {
> +               } else if (host->caps & MMC_CAP_SDIO_IRQ) {
>                         mmc_host_clk_hold(host);
>                         host->ops->enable_sdio_irq(host, 1);
>                         mmc_host_clk_release(host);
> @@ -229,7 +229,7 @@ static int sdio_card_irq_put(struct mmc_card *card)
>                 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
>                         atomic_set(&host->sdio_irq_thread_abort, 1);
>                         kthread_stop(host->sdio_irq_thread);
> -               } else {
> +               } else if (host->caps & MMC_CAP_SDIO_IRQ) {
>                         mmc_host_clk_hold(host);
>                         host->ops->enable_sdio_irq(host, 0);
>                         mmc_host_clk_release(host);
> -- 1.7.1
>

Thanks for working on this!

Kind regards
Uffe
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