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| author | Will Deacon <will.deacon@arm.com> | 2011-11-22 18:01:46 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2011-11-22 18:01:46 +0000 |
| commit | e5a21327644adba32816f74a415114d11c57f2e9 (patch) | |
| tree | 81264b2c3ba630e7f5d4f43f9ad99e6268515dad /arch/arm/kernel/perf_event.c | |
| parent | bce34d14428d35d9a06ddc10cd46ecef311764c9 (diff) | |
| download | linux-e5a21327644adba32816f74a415114d11c57f2e9.tar.gz linux-e5a21327644adba32816f74a415114d11c57f2e9.tar.bz2 linux-e5a21327644adba32816f74a415114d11c57f2e9.zip | |
ARM: perf: check that we have a platform device when reserving PMU
Attempting to use a hardware counter on a platform with a supported PMU
but where the platform_device (defining the interrupts) has not been
registered results in a NULL pointer dereference.
This patch fixes the problem by checking that we actually have a platform
device registered before attempting to grab the interrupts.
Reported-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/kernel/perf_event.c')
| -rw-r--r-- | arch/arm/kernel/perf_event.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index e508066d3d64..c475379199b1 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -402,6 +402,9 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu) int i, err, irq, irqs; struct platform_device *pmu_device = armpmu->plat_device; + if (!pmu_device) + return -ENODEV; + err = reserve_pmu(armpmu->type); if (err) { pr_warning("unable to reserve pmu\n"); |