From: Theodore Ts'o <tytso@mit.edu>
Date: Mon, 4 Mar 2013 16:59:12 +0000 (-0500)
Subject: random: fix locking dependency with the tasklist_lock
X-Git-Tag: v3.9-rc2~12^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b980955236922ae6106774511c5c05003d3ad225;p=pandora-kernel.git

random: fix locking dependency with the tasklist_lock

Commit 6133705494bb introduced a circular lock dependency because
posix_cpu_timers_exit() is called by release_task(), which is holding
a writer lock on tasklist_lock, and this can cause a deadlock since
kill_fasync() gets called with nonblocking_pool.lock taken.

There's no reason why kill_fasync() needs to be taken while the random
pool is locked, so move it out to fix this locking dependency.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Russ Dill <Russ.Dill@gmail.com>
Cc: stable@kernel.org
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