From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Thu, 26 Feb 2015 23:39:21 +0000 (+0100)
Subject: idle / sleep: Avoid excessive disabling and enabling interrupts
X-Git-Tag: omap-for-v4.1/wl12xx-dt~58^2~3^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01e04f466e12e883907937eb04a9010533363f55;p=pandora-kernel.git

idle / sleep: Avoid excessive disabling and enabling interrupts

Disabling interrupts at the end of cpuidle_enter_freeze() is not
useful, because its caller, cpuidle_idle_call(), re-enables them
right away after invoking it.

To avoid that unnecessary back and forth dance with interrupts,
make cpuidle_enter_freeze() enable interrupts after calling
enter_freeze_proper() and drop the local_irq_disable() at its
end, so that all of the code paths in it end up with interrupts
enabled.  Then, cpuidle_idle_call() will not need to re-enable
interrupts after calling cpuidle_enter_freeze() any more, because
the latter will return with interrupts enabled, in analogy with
cpuidle_enter().

Reported-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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