From: Shawn Guo <shawn.guo@linaro.org>
Date: Thu, 6 Dec 2012 14:54:41 +0000 (+0800)
Subject: ARM: imx: return zero in case next event gets a large increment
X-Git-Tag: v3.9-rc1~37^2^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eea8e326ff476e418b99b6daa97f9bd85ac6c523;p=pandora-kernel.git

ARM: imx: return zero in case next event gets a large increment

The return of v2_set_next_event() will lead to an infinite loop in
tick_handle_oneshot_broadcast() - "goto again;" with imx6q WAIT mode
(to be enabled).  This happens because when global event did not expire
any CPU local events, the broadcast device will be rearmed to a CPU
local next_event, which could be far away from now and result in a
max_delta_tick programming in set_next_event().

Fix the problem by detecting those next events with increments larger
than 0x7fffffff, and simply return zero in that case.

It leaves mx1_2_set_next_event() unchanged since only v2_set_next_event()
will be running with imx6q WAIT mode support.

Thanks Russell King for helping understand the problem.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
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