From 3b9c10e98021e1f92e6f8c7ce1778b86ba68db10 Mon Sep 17 00:00:00 2001
From: Daniel Fu <danifu@nvidia.com>
Date: Fri, 30 Aug 2013 19:48:22 +0800
Subject: [PATCH] cpuidle: Check the result of cpuidle_get_driver() against
 NULL

If the current CPU has no cpuidle driver, drv will be NULL in
cpuidle_driver_ref().  Check if that is the case before trying
to bump up the driver's refcount to prevent the kernel from
crashing.

[rjw: Subject and changelog]
Signed-off-by: Daniel Fu <danifu@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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