From: Eric Dumazet <edumazet@google.com>
Date: Thu, 31 May 2012 11:39:05 +0000 (+0200)
Subject: block: avoid infinite loop in get_task_io_context()
X-Git-Tag: v3.5-rc1~26^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3c9c708c9fc967e389f85bc735e4c1f65d67334e;p=pandora-kernel.git

block: avoid infinite loop in get_task_io_context()

Calling get_task_io_context() on a exiting task which isn't %current can
loop forever. This triggers at boot time on my dev machine.

BUG: soft lockup - CPU#3 stuck for 22s ! [mountall.1603]

Fix this by making create_task_io_context() returns -EBUSY in this case
to break the loop.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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