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markers: fix unregister
authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Fri, 14 Nov 2008 22:47:35 +0000 (17:47 -0500)
committerIngo Molnar <mingo@elte.hu>
Sun, 16 Nov 2008 08:01:26 +0000 (09:01 +0100)
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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