[tip:perfcounters/urgent] perf_counter: x86: Fix PMU resource leak

tip-bot for Peter Zijlstra
2009-09-20T18:07:13Z

Commit-ID: a1792cdacaf5180e04e07811e220c4a3b4a9c33e
Gitweb: http://git.kernel.org/tip/a1792cdacaf5180e04e07811e220c4a3b4a9c33e
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Wed, 9 Sep 2009 10:04:47 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Sun, 20 Sep 2009 19:53:57 +0200

perf_counter: x86: Fix PMU resource leak

Dave noticed that we leak the PMU resource reservations when we
fail the hardware counter init.

Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: David Miller <davem@davemloft.net>
LKML-Reference: <1252483487.7746.164.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

---
arch/x86/kernel/cpu/perf_counter.c | 9 ++++++---
1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index dbdf712..a6c8b27 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -924,6 +924,8 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
if (err)
return err;

+ counter->destroy = hw_perf_counter_destroy;
+
/*
* Generate PMC IRQs:
* (keep 'enabled' bit clear for now)
@@ -953,8 +955,6 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
return -EOPNOTSUPP;
}

- counter->destroy = hw_perf_counter_destroy;
-
/*
* Raw event type provide the config in the event structure
*/
@@ -2107,8 +2107,11 @@ const struct pmu *hw_perf_counter_init(struct perf_counter *counter)
int err;

err = __hw_perf_counter_init(counter);
- if (err)
+ if (err) {
+ if (counter->destroy)
+ counter->destroy(counter);
return ERR_PTR(err);
+ }

return &pmu;
}