linux-kernel - Re: [PATCH 2/2] drivers/perf: arm_pmu: Fix NULL pointer dereference during probe

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Date:   Wed, 31 Aug 2016 19:17:51 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Will Deacon <will.deacon@....com>
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Mark Rutland <mark.rutland@....com>,
        Eric Anholt <eric@...olt.net>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com
Subject: Re: [PATCH 2/2] drivers/perf: arm_pmu: Fix NULL pointer dereference during probe

Will Deacon <will.deacon@....com> writes:

> On Sat, Aug 27, 2016 at 04:19:50PM +0000, Stefan Wahren wrote:
>> 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 <stefan.wahren@...e.com>
>> 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@...libre.com>

Kevin