From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Fri, 14 Nov 2008 22:47:35 +0000 (-0500)
Subject: markers: fix unregister
X-Git-Tag: v2.6.29-rc1~586^2~58^3~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2bdba316c989da028a59becf7516c6350ce3c173;p=pandora-kernel.git

markers: fix unregister

Impact: fix marker registers/unregister race

get_marker() can return a NULL entry because the mutex is released in
the middle of those functions. Make sure we check to see if it has been
concurrently removed.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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