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| author | Will Deacon <will.deacon@arm.com> | 2015-10-12 14:48:39 +0100 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2015-10-15 17:11:23 +0200 |
| commit | fb659882cc6482bd2e32ec0ab8ab7afeda649413 (patch) | |
| tree | 2ae37a845f1964b8b89fdf8e5dfd90233cd8a142 /drivers/perf/arm_pmu.c | |
| parent | a0bcbe969f564d1ec08658170dda72a1b7e9053a (diff) | |
| download | linux-fb659882cc6482bd2e32ec0ab8ab7afeda649413.tar.gz | |
drivers/perf: arm_pmu: avoid CPU device_node reference leak
of_cpu_device_node_get increments the reference count on the CPU device_node, so we must take care to of_node_put once we've finished with it. This patch fixes the perf IRQ probing code to avoid the leak. Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/perf/arm_pmu.c')
| -rw-r--r-- | drivers/perf/arm_pmu.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 2365a32a595e..be3755c973e9 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -823,9 +823,15 @@ static int of_pmu_irq_cfg(struct arm_pmu *pmu) } /* Now look up the logical CPU number */ - for_each_possible_cpu(cpu) - if (dn == of_cpu_device_node_get(cpu)) + for_each_possible_cpu(cpu) { + struct device_node *cpu_dn; + + cpu_dn = of_cpu_device_node_get(cpu); + of_node_put(cpu_dn); + + if (dn == cpu_dn) break; + } if (cpu >= nr_cpu_ids) { pr_warn("Failed to find logical CPU for %s\n", |