forked from luck/tmp_suning_uos_patched
perf: Fix context leak in put_event()
Commit:a83fe28e2e
("perf: Fix put_event() ctx lock") changed the locking logic in put_event() by replacing mutex_lock_nested() with perf_event_ctx_lock_nested(), but didn't fix the subsequent mutex_unlock() with a correct counterpart, perf_event_ctx_unlock(). Contexts are thus leaked as a result of incremented refcount in perf_event_ctx_lock_nested(). Signed-off-by: Leon Yu <chianglungyu@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Fixes:a83fe28e2e
("perf: Fix put_event() ctx lock") Link: http://lkml.kernel.org/r/1424954613-5034-1-git-send-email-chianglungyu@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -3591,7 +3591,7 @@ static void put_event(struct perf_event *event)
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ctx = perf_event_ctx_lock_nested(event, SINGLE_DEPTH_NESTING);
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WARN_ON_ONCE(ctx->parent_ctx);
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perf_remove_from_context(event, true);
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mutex_unlock(&ctx->mutex);
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perf_event_ctx_unlock(event, ctx);
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_free_event(event);
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}
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