From: Will Deacon <will.deacon@arm.com>
Date: Tue, 6 Mar 2012 16:34:22 +0000 (+0100)
Subject: ARM: 7355/1: perf: clear overflow flag when disabling counter on ARMv7 PMU
X-Git-Tag: v3.2.10~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=075964ad4370162964f41ba1136b8581ab1a302a;p=pandora-kernel.git

ARM: 7355/1: perf: clear overflow flag when disabling counter on ARMv7 PMU

commit 99c1745b9c76910e195889044f914b4898b7c9a5 upstream.

When disabling a counter on an ARMv7 PMU, we should also clear the
overflow flag in case an overflow occurred whilst stopping the counter.
This prevents a spurious overflow being picked up later and leading to
either false accounting or a NULL dereference.

Reported-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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