From: Will Deacon <will.deacon@arm.com>
Date: Tue, 22 Nov 2011 18:01:46 +0000 (+0000)
Subject: ARM: perf: check that we have a platform device when reserving PMU
X-Git-Tag: v3.2-rc4~2^2~11^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e5a21327644adba32816f74a415114d11c57f2e9;p=pandora-kernel.git

ARM: perf: check that we have a platform device when reserving PMU

Attempting to use a hardware counter on a platform with a supported PMU
but where the platform_device (defining the interrupts) has not been
registered results in a NULL pointer dereference.

This patch fixes the problem by checking that we actually have a platform
device registered before attempting to grab the interrupts.

Reported-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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