From: Joe Thornber <ejt@redhat.com>
Date: Mon, 21 Oct 2013 10:44:57 +0000 (+0100)
Subject: dm cache policy mq: protect residency method with existing mutex
X-Git-Tag: v3.13-rc1~97^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99ba2ae4cd876bbcedb01d94c1a7952ce171418e;p=pandora-kernel.git

dm cache policy mq: protect residency method with existing mutex

It is safe to use a mutex in mq_residency() at this point since it is
only called from ioctl context.  But future-proof mq_residency() by
using might_sleep() to catch new contexts that cannot sleep.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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