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ARM: perf: check that we have a platform device when reserving PMU

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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>
This commit is contained in:
Will Deacon 2011-11-22 18:01:46 +00:00
parent bce34d1442
commit e5a2132764
1 changed files with 3 additions and 0 deletions
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3
arch/arm/kernel/perf_event.c
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@ -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");