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| author | Stefan Wahren <stefan.wahren@i2se.com> | 2016-08-27 16:19:50 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-09-02 17:17:52 +0100 |
| commit | 63fb0a9516b2c4e23293d7253c14c40aa9c2b7d1 (patch) | |
| tree | 6f711796620e53c304f02123168491060284de11 | |
| parent | 753246840d012ae34ea80a1d40bc1546c62fb957 (diff) | |
| download | lwn-63fb0a9516b2c4e23293d7253c14c40aa9c2b7d1.tar.gz lwn-63fb0a9516b2c4e23293d7253c14c40aa9c2b7d1.zip | |
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>
| -rw-r--r-- | drivers/perf/arm_pmu.c | 2 |
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; |