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| author | Julien Grall <julien.grall@arm.com> | 2016-05-31 12:41:21 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-06-03 10:16:20 +0100 |
| commit | 121323ae668e456d0ed328f5b77c22bf5dd8e4de (patch) | |
| tree | ff3fc3754aedd477965bdf84b8ad1e6017da77e5 /drivers/perf | |
| parent | 8051f4d16ef1d037e7b12abab79c3e0b960f4d36 (diff) | |
| download | lwn-121323ae668e456d0ed328f5b77c22bf5dd8e4de.tar.gz lwn-121323ae668e456d0ed328f5b77c22bf5dd8e4de.zip | |
drivers/perf: arm_pmu: Fix reference count of a device_node in of_pmu_irq_cfg
The only function called by of_pmu_irq_cfg that will increment the
reference count on dn is of_parse_phandle.
Each time we successfully parse a possible CPU from an
interrupt-affinity property, we increment the refcount of that CPU node
once via of_parse_handle. After validating the CPU is possible, we
decrement the refcount once. Subsequently, we decrement the refcount
again, either as part of an early break if we don't have a matching SPI,
or as part of the end of the loop body.
This will lead to decrementing twice the refcounnt.
Remove the second pairs of call to of_node_put as nobody is using dn
between the first and second call to of_node_put.
Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm_pmu.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index f2d01d4d9364..6401f0c9fb6e 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -950,17 +950,14 @@ static int of_pmu_irq_cfg(struct arm_pmu *pmu) /* For SPIs, we need to track the affinity per IRQ */ if (using_spi) { - if (i >= pdev->num_resources) { - of_node_put(dn); + if (i >= pdev->num_resources) break; - } irqs[i] = cpu; } /* Keep track of the CPUs containing this PMU type */ cpumask_set_cpu(cpu, &pmu->supported_cpus); - of_node_put(dn); i++; } while (1); |