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perf: Fix perf_init_event() 

We ought to return -ENOENT when non of the registered PMUs
recognise the requested event.

This fixes a boot crash that occurs if no PMU is available
but the NMI watchdog tries to register an event.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-09-10 17:38:06 +02:00 committed by Ingo Molnar
parent cee010ec52
commit e5f4d3394a
1 changed files with 5 additions and 2 deletions
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7
kernel/perf_event.c
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@ -5236,12 +5236,15 @@ struct pmu *perf_init_event(struct perf_event *event)
list_for_each_entry_rcu(pmu, &pmus, entry) {
int ret = pmu->event_init(event);
if (!ret)
break;
goto unlock;
if (ret != -ENOENT) {
pmu = ERR_PTR(ret);
break;
goto unlock;
}
}
pmu = ERR_PTR(-ENOENT);
unlock:
srcu_read_unlock(&pmus_srcu, idx);
return pmu;