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ARM: 7185/1: perf: don't assign platform_device on unsupported CPUs

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In the unlikely case that a platform registers a PMU platform_device
when running on a CPU that is unsupported by perf, we will encounter a
NULL dereference when trying to assign the platform_device to the
cpu_pmu structure.

This patch checks that the CPU is supported by perf before assigning
the platform_device.

Reported-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2011-12-02 18:16:01 +01:00 committed by Russell King
parent de66a97901
commit 6bd054096d
1 changed files with 3 additions and 0 deletions
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3
arch/arm/kernel/perf_event.c
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@ -640,6 +640,9 @@ static struct platform_device_id armpmu_plat_device_ids[] = {
static int __devinit armpmu_device_probe(struct platform_device *pdev)
{
if (!cpu_pmu)
return -ENODEV;
cpu_pmu->plat_device = pdev;
return 0;
}