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drivers/perf: arm_pmu: Fix NULL pointer dereference during probe 

Patch 7f1d642fbb ("drivers/perf: arm-pmu: Fix handling of SPI lacking
interrupt-affinity property") unintended also fixes perf_event support
for bcm2835 which doesn't have PMU interrupts. Unfortunately this change
introduce a NULL pointer dereference on bcm2835, because irq_is_percpu
always expected to be called with a valid IRQ. So fix this regression
by validating the IRQ before.

Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Fixes: 7f1d642fbb ("drivers/perf: arm-pmu: Fix handling of SPI lacking "interrupt-affinity" property")
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Stefan Wahren 2016-08-27 16:19:50 +00:00 committed by Catalin Marinas
parent 753246840d
commit 63fb0a9516
1 changed files with 1 additions and 1 deletions
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2
drivers/perf/arm_pmu.c
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@ -970,7 +970,7 @@ static int of_pmu_irq_cfg(struct arm_pmu *pmu)
if (cpumask_weight(&pmu->supported_cpus) == 0) {
int irq = platform_get_irq(pdev, 0);
if (irq_is_percpu(irq)) {
if (irq >= 0 && irq_is_percpu(irq)) {
/* If using PPIs, check the affinity of the partition */
int ret;