2.6.34-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stephane Eranian <eran...@google.com>
commit 4b24a88b35e15e04bd8f2c5dda65b5dc8ebca05f upstream.
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 <eran...@google.com>
Cc: pet...@infradead.org
Cc: pau...@samba.org
Cc: da...@davemloft.net
Cc: fweis...@gmail.com
Cc: robert.rich...@amd.com
Cc: perfmon2-de...@lists.sf.net
LKML-Reference: <4ba1568b.15185e0a.182a.7...@mx.google.com>
Signed-off-by: Ingo Molnar <mi...@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
arch/x86/kernel/cpu/perf_event.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -460,8 +460,11 @@ static int __hw_perf_event_init(struct p
if (atomic_read(&active_events) == 0) {
if (!reserve_pmc_hardware())
err = -EBUSY;
- else
+ else {
err = reserve_bts_hardware();
+ if (err)
+ release_pmc_hardware();
+ }
}
if (!err)
atomic_inc(&active_events);
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