linux-kernel - Re: [PATCH] mmc: fix to refer NULL pointer

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Date:	Mon, 28 Jan 2013 11:14:08 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Joonyoung Shim <jy0922.shim@...sung.com>, cjb@...top.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: fix to refer NULL pointer

On 01/27/2013 05:10 PM, Guennadi Liakhovetski wrote:
> On Sat, 26 Jan 2013, Joonyoung Shim wrote:
> 
>> Check whether host->sdio_irq_thread is NULL before wake_up_process() is
>> called about host->sdio_irq_thread.
> 
> Actually, mmc_signal_sdio_irq() shouldn't be called if SDIO IRQ isn't 
> used...
Right, But I think that need to check whether the host->sdio_irq_thread is assigned or not.

Best Regards,
Jaehoon Chung
> 
> Thanks
> Guennadi
> 
>>
>> Signed-off-by: Joonyoung Shim <jy0922.shim@...sung.com>
>> ---
>> Currently the kernel panic to refer NULL pointer about
>> host->sdio_irq_thread are occuring at the trats board using Samsung
>> SDHCI driver.
>>
>>  include/linux/mmc/host.h |    3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>> index 61a10c1..2950fea 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -372,7 +372,8 @@ static inline void mmc_signal_sdio_irq(struct mmc_host *host)
>>  {
>>  	host->ops->enable_sdio_irq(host, 0);
>>  	host->sdio_irq_pending = true;
>> -	wake_up_process(host->sdio_irq_thread);
>> +	if (host->sdio_irq_thread)
>> +		wake_up_process(host->sdio_irq_thread);
>>  }
>>  
>>  #ifdef CONFIG_REGULATOR
>> -- 
>> 1.7.9.5
>>
>> --
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> 
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/
> --
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