diff options
| author | Will Deacon <will.deacon@arm.com> | 2011-12-02 18:16:01 +0100 |
|---|---|---|
| committer | Nicolas Pitre <nicolas.pitre@linaro.org> | 2011-12-15 09:24:51 -0500 |
| commit | 2150f72fe35397cc6d6ce39866bd0462cfbcc916 (patch) | |
| tree | 8689b33de38869fea12252656d5db301f49d18f7 | |
| parent | f8489660a18c1865ee4f4a47593fd2dcf67a4e88 (diff) | |
ARM: 7185/1: perf: don't assign platform_device on unsupported CPUsHEADlinux-linaro-3.1-2011.12-1master
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>
(cherry picked from commit 6bd054096dce061560cee0e016e292e588dc438f)
| -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 5e455094df8..eacc1b09060 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -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; } |