linux-kernel - Re: [PATCH] mmc:core:if detect mmc card remove,don't wait for req done

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Date:	Thu, 20 Dec 2012 07:49:18 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	zhenpeng.qian@...to.com, Chris Ball <cjb@...top.org>
Cc:	Greg KH <gregkh@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Driver Project <devel@...uxdriverproject.org>,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH] mmc:core:if detect mmc card remove,don't wait for req done

Hi,

On Thu, Dec 20, 2012 at 1:32 AM,  <zhenpeng.qian@...to.com> wrote:
>
>         I find a bug about mmc/core/core.c, and send you a patch which I fix
> this bug.
>
>         In fact, the bug is a low probability of occurrence.
>
>         Hope you help me to analyze it and discuss with me.

I've added the proper people - Chris Ball and linux-mmc - to the
participants list.

I also wanted to check with you: the commit message implies that this
can cause an IO timeout and then a call to
msmsdcc_start_command_deferred() with a NULL cmd->mrq. Which I assume
results in a NULL pointer dereference and Oops, but that wasn't
spelled out.

Chris, please give it a look, and perhaps edit the commit message a bit.

                     Linus

Download attachment "0001-mmc-core.patch" of type "application/octet-stream" (2056 bytes)