From: Andreas Larsson <andreas@gaisler.com>
Date: Fri, 29 Aug 2014 15:09:18 +0000 (+0200)
Subject: sparc: leon: Fix race condition between leon_cycles_offset and timer_interrupt
X-Git-Tag: fixes-against-v3.18-rc2~116^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=384859d2af8ead22c9e5a570a4ab89f1b563c8e5;p=pandora-kernel.git

sparc: leon: Fix race condition between leon_cycles_offset and timer_interrupt

This makes sure that leon_cycles_offset takes the pending bit into
account and that leon_clear_clock_irq clears the pending bit. Otherwise,
if leon_cycles_offset is executed after the timer has wrapped but before
timer_interrupt has increased timer_cs_internal_counter, time can be
perceived to go backwards.

Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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