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perf_event: Make software events work again 

Commit 6bde9b6ce0 ("perf: Add
group scheduling transactional APIs") added code to allow a
group to be scheduled in a single transaction.  However, it
introduced a bug in handling events whose pmu does not implement
transactions -- at the end of scheduling in the events in the
group, in the non-transactional case the code now falls through
to the group_error label, and proceeds to unschedule all the
events in the group and return failure.

This fixes it by returning 0 (success) in the non-transactional
case.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Lin Ming <ming.m.lin@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: eranian@gmail.com
LKML-Reference: <20100508105800.GB10650@brick.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Mackerras 2010-05-08 20:58:00 +10:00 committed by Ingo Molnar
parent ed82702155
commit 6e85158cf5
1 changed files with 6 additions and 6 deletions
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12
kernel/perf_event.c
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@ -664,13 +664,13 @@ group_sched_in(struct perf_event *group_event,
}
}
if (txn) {
ret = pmu->commit_txn(pmu);
if (!ret) {
pmu->cancel_txn(pmu);
if (!txn)
return 0;
return 0;
}
ret = pmu->commit_txn(pmu);
if (!ret) {
pmu->cancel_txn(pmu);
return 0;
}
group_error: