From: Will Deacon <will.deacon@arm.com>
Date: Tue, 13 Dec 2011 19:40:45 +0000 (+0100)
Subject: perf events: Fix ring_buffer_wakeup() brown paperbag bug
X-Git-Tag: v3.2-rc7~45^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44b7f4b98d8877e2a4427f2a2f2e42ae8227a58f;p=pandora-kernel.git

perf events: Fix ring_buffer_wakeup() brown paperbag bug

Commit 10c6db11 ("perf: Fix loss of notification with multi-event")
seems to unconditionally dereference event->rb in the wakeup handler,
this is wrong, there might not be a buffer attached.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20111213152651.GP20297@mudshark.cambridge.arm.com
[ minor edits ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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