From: Will Deacon <will.deacon@arm.com>
Date: Tue, 6 Mar 2012 16:34:50 +0000 (+0100)
Subject: ARM: 7356/1: perf: check that we have an event in the PMU IRQ handlers
X-Git-Tag: v3.2.10~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=288733a6065034d1870b02b164da0fb2d8452178;p=pandora-kernel.git

ARM: 7356/1: perf: check that we have an event in the PMU IRQ handlers

commit f6f5a30c834135c9f2fa10400c59ebbdd9188567 upstream.

The PMU IRQ handlers in perf assume that if a counter has overflowed
then perf must be responsible. In the paranoid world of crazy hardware,
this could be false, so check that we do have a valid event before
attempting to dereference NULL in the interrupt path.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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