From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Date: Tue, 6 Feb 2007 00:12:45 +0000 (-0800)
Subject: [CPUFREQ] ondemand governor use new cpufreq rwsem locking in work callback
X-Git-Tag: v2.6.21-rc1~95^2~8
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56463b78cdca8e9ff8cc1759bca0c0777a061d6b;p=pandora-kernel.git

[CPUFREQ] ondemand governor use new cpufreq rwsem locking in work callback

Eliminate flush_workqueue in cpufreq_governor(STOP) callpath. Using flush
there has a deadlock potential as in

http://uwsg.iu.edu/hypermail/linux/kernel/0611.3/1223.html

Also, cleanup the locking issues with do_dbs_timer delayed_work callback.  As
it changes the CPU frequency using __cpufreq_target, it needs to have
policy_rwsem in write mode, which also protects it from hot plug.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Jones <davej@redhat.com>
---

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