From: Nishanth Menon <nm@ti.com>
Date: Fri, 18 Jan 2013 19:52:35 +0000 (+0000)
Subject: PM / devfreq: exynos4_bus: honor RCU lock usage
X-Git-Tag: v3.8-rc5~6^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8fa938acb318378463987b04be083dc2467e0480;p=pandora-kernel.git

PM / devfreq: exynos4_bus: honor RCU lock usage

OPP pointers cannot be expected to be valid beyond the boundary
of rcu_read_lock and rcu_read_unlock. Unfortunately, the current
exynos4 busfreq driver does not honor the usage constraint and stores
the OPP pointer in struct busfreq_data. This could potentially
become invalid later such as: across devfreq opp change decisions,
resulting in unpredictable behavior.

To fix this, we introduce a busfreq specific busfreq_opp_info
structure which is used to handle OPP information. OPP information
is de-referenced to voltage and frequency pairs as needed into
busfreq_opp_info structure and used as needed.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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