From: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Date: Fri, 4 May 2012 21:06:02 +0000 (-0700)
Subject: cpuidle: add checks to avoid NULL pointer dereference
X-Git-Tag: v3.6-rc1~82^2^6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b0a0e9a15b976d91f3b5ae619c6a8964c2818eb;p=pandora-kernel.git

cpuidle: add checks to avoid NULL pointer dereference

The existing check for dev == NULL in __cpuidle_register_device() is
rendered useless because dev is dereferenced before the check itself.
Moreover, correctly speaking, it is the job of the callers of this
function, i.e., cpuidle_register_device() & cpuidle_enable_device() (which
also happen to be exported functions) to ensure that
__cpuidle_register_device() is called with a non-NULL dev.

So add the necessary dev == NULL checks in the two callers and remove the
(useless) check from __cpuidle_register_device().

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
---

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