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authorStefan Wahren <stefan.wahren@i2se.com>2016-08-27 16:19:50 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2016-09-02 17:17:52 +0100
commit63fb0a9516b2c4e23293d7253c14c40aa9c2b7d1 (patch)
tree6f711796620e53c304f02123168491060284de11 /drivers
parent753246840d012ae34ea80a1d40bc1546c62fb957 (diff)
downloadlinux-63fb0a9516b2c4e23293d7253c14c40aa9c2b7d1.tar.bz2
drivers/perf: arm_pmu: Fix NULL pointer dereference during probe
Patch 7f1d642fbb5c ("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: 7f1d642fbb5c ("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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/perf/arm_pmu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 1b48bf0a6780..f5e1008a223d 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -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;