linux-kernel - Re: One bug of SDHCI driver

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Date:	Wed, 09 Jul 2014 00:03:26 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Jaehoon Chung <jh80.chung@...sung.com>, chris@...ntf.net,
	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,

Why add "mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;" ?  How to fix this bug?

Could you please give out some idea about this bug?


Thanks,
Zhonghui


On 2014/7/6 23:19, Fu, Zhonghui wrote:
> Yes, "mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;" of "sdhci_add_host" function in host/sdhci.c file make oops.
>
> "sdio_card_irq_get" function in core/sdio_irq.c file:
> if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {  /* the condition is false */
>             atomic_set(&host->sdio_irq_thread_abort, 0);
>             host->sdio_irq_thread =                                               
>                 kthread_run(sdio_irq_thread, host,
>                         "ksdioirqd/%s", mmc_hostname(host));
>
>
> This will make  "host->sdio_irq_thread" a NULL pointer in "mmc_sdio_resume" functon of core/sdio.c file.
>
>
>
> Thanks,
> Zhonghui
>
>
>
> On 2014/7/4 10:40, Jaehoon Chung wrote:
>> Hi,
>>
>> just use the MMC_CAP2_SDIO_IRQ_NOTHREAD?
>>
>> if (!err && host->sdio_irq && !(host->quirks & MMC_CAP2_SDIO_IRQ_NOTHREAD))
>> 	wake_up_process(host->sdio_irq_thread);
>>
>> I didn't test this..but i believe that it will be fixed.
>>
>> Best Regards,
>> Jaehoon Chung
>>
>> On 07/04/2014 12:47 AM, Fu, Zhonghui wrote:
>>> Hi, all
>>>
>>> The statement "mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;" is added in "sdhci_add_host" function in host/sdhci.c file. In some cases, this will make  "host->sdio_irq_thread" a NULL pointer in "mmc_sdio_resume" functon of core/sdio.c file and lead to resume failure. Could you please give me some advice how to fix this bug?
>>>
>>>
>>>
>>> Thanks,
>>> Zhonghui
>>>
>>>
>>>
>>>
>>>
>>>

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