linux-kernel - Re: [PATCH] mtd: blkdevs: fix potential deadlock + lockdep warnings

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Message-ID: <20151031002723.GN13239@google.com>
Date:	Fri, 30 Oct 2015 17:27:23 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Felipe Balbi <balbi@...com>,
	tony@...mide.com, stable@...r.kernel.org
Subject: Re: [PATCH] mtd: blkdevs: fix potential deadlock + lockdep warnings

On Mon, Oct 26, 2015 at 07:38:49PM -0700, Brian Norris wrote:
> Commit 073db4a51ee4 ("mtd: fix: avoid race condition when accessing
> mtd->usecount") fixed a race condition but due to poor ordering of the
> mutex acquisition, introduced a potential deadlock.
[...]
> 
> Fixes: 073db4a51ee4 ("mtd: fix: avoid race condition when accessing mtd->usecount")
> Reported-by: Felipe Balbi <balbi@...com>
> Tested-by: Felipe Balbi <balbi@...com>
> Signed-off-by: Brian Norris <computersforpeace@...il.com>
> Cc: <stable@...r.kernel.org>

Pushed to l2-mtd.git.

> ---
> Resending as a proper patch
> 
> Note: I tried to reproduce this lockdep warning myself but couldn't. But I saw
> no problem under the new patch either.
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