linux-kernel - Re: One bug of SDHCI driver

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Date:	Tue, 15 Jul 2014 10:54:53 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Chris Ball <chris@...ntf.net>
CC:	Jaehoon Chung <jh80.chung@...sung.com>, ulf.hansson@...aro.org,
	tgih.jun@...sung.com, aaron.lu@...el.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	jackey.shen@....com, gregkh@...uxfoundation.org
Subject: Re: One bug of SDHCI driver


Hi,

The data type of "host" is "struct mmc_host", and there is not "quirks" member in this structure.


Thanks,
Zhonghui

On 2014/7/14 21:26, Chris Ball wrote:
> Hi Zhonghui,
>
> On Tue, Jul 08 2014, Fu, Zhonghui wrote:
>> Why add "mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;" ?  How to fix this bug?
>>
>> Could you please give out some idea about this bug?
> Jaehoon already gave you a patch to fix this bug.  Here it is again in
> proper patch form.  Please can you test it and let us know whether it
> fixes the crash?  Thanks.
>
>
> From: Chris Ball <chris@...ntf.net>
> 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.
>
> Reported-by: Fu, Zhonghui <zhonghui.fu@...ux.intel.com>
> [Patch suggested by Jaehoon Chung]
> Signed-off-by: Chris Ball <chris@...ntf.net>
> ---
>  drivers/mmc/core/sdio.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index e636d9e..2a128e2 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -992,7 +992,8 @@ static int mmc_sdio_resume(struct mmc_host *host)
>  		}
>  	}
>  
> -	if (!err && host->sdio_irqs)
> +	if (!err && host->sdio_irqs &&
> +	    !(host->quirks & MMC_CAP2_SDIO_IRQ_NOTHREAD))
>  		wake_up_process(host->sdio_irq_thread);
>  	mmc_release_host(host);
>  

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