[PATCH 2/2] drivers/perf: arm_pmu: Fix NULL pointer dereference during probe

Will Deacon [off-list ref] writes:

On Sat, Aug 27, 2016 at 04:19:50PM +0000, Stefan Wahren wrote:

quoted

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.

Signed-off-by: Stefan Wahren <redacted>
Fixes: 7f1d642fbb5c ("drivers/perf: arm-pmu: Fix handling of SPI lacking \"interrupt-affinity\" property")
---
 drivers/perf/arm_pmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Thanks, these two look good to me. I'll queue them up as fixes and hopefully
they'll land in -rc5.

FWIW, I tested this on bcm2835-rpi and verified it fixes the boot
problem in mainline.

Tested-by: Kevin Hilman <khilman@baylibre.com>

Kevin