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(parent: c760a7d) | patch
perf events: Fix ring_buffer_wakeup() brown paperbag bug
authorWill Deacon <will.deacon@arm.com>
Tue, 13 Dec 2011 19:40:45 +0000 (20:40 +0100)
committerIngo Molnar <mingo@elte.hu>
Wed, 14 Dec 2011 07:44:53 +0000 (08:44 +0100)
commita5a423e822a22130d1cf922c64d7ba48728d00d3
tree929c7c5c177fa072216445de276592843ebae4d8tree | snapshot
parentc760a7df6eddcb9b8d399d0d644df161c1bbad6fcommit | diff
perf events: Fix ring_buffer_wakeup() brown paperbag bug

Commit 6b47df51 ("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>
kernel/events/core.c diff | blob | history
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