linux-kernel - Re: One bug of SDHCI driver

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Date:	Tue, 15 Jul 2014 13:14:45 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>,
	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

On 07/15/2014 11:54 AM, Fu, Zhonghui wrote:
> 
> Hi,
> 
> The data type of "host" is "struct mmc_host", and there is not "quirks" member in this structure.
Sorry for wrong typo.
You use the "host->caps2" instead of "host->quirks".


Best Regards,
Jaehoon Chung
> 
> 
> 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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