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From: Stephane Eranian on 17 Mar 2010 18:30
If reserve_pmc_hardware() succeeds but reserve_ds_buffers()
fails, then we need to release_pmc_hardware. It won't be done
by the destroy() callback because we return before setting it
in case of error.

Signed-off-by: Stephane Eranian <eranian(a)google.com>

--
perf_event.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 978d297..8d9b152 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -455,8 +455,11 @@ static int __hw_perf_event_init(struct perf_event *event)
if (atomic_read(&active_events) == 0) {
if (!reserve_pmc_hardware())
err = -EBUSY;
- else
+ else {
err = reserve_ds_buffers();
+ if (err)
+ release_pmc_hardware();
+ }
}
if (!err)
atomic_inc(&active_events);
--
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