linux-kernel - Re: [PATCH v2] mmc: fix host release issue after discard operation

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Message-ID: <52952248.6060700@broadcom.com>
Date:	Tue, 26 Nov 2013 14:35:52 -0800
From:	"Ray Jui" <rjui@...adcom.com>
To:	"Chris Ball" <cjb@...top.org>
cc:	"Seungwon Jeon" <tgih.jun@...sung.com>,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2] mmc: fix host release issue after discard
 operation

On 11/26/2013 2:06 PM, Chris Ball wrote:
> Hi Ray,
>
> On Sat, Oct 26 2013, Ray Jui wrote:
>> Under function mmc_blk_issue_rq, after an MMC discard operation,
>> the MMC request data structure may be freed in memory. Later in
>> the same function, the check of req->cmd_flags & MMC_REQ_SPECIAL_MASK
>> is dangerous and invalid. It causes the MMC host not to be released
>> when it should
>>
>> This patch fixes the issue by marking the special request down before
>> the discard/flush operation
>>
>> Reported by: Harold (SoonYeal) Yang <haroldsy@...adcom.com>
>> Signed-off-by: Ray Jui <rjui@...adcom.com>
>> Reviewed-by: Seungwon Jeon <tgih.jun@...sung.com>
>
> Thanks, pushed to mmc-next for 3.14 and -stable.
>
> - Chris.
>
Great!

Thanks,

Ray

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