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

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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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Venkatesh Pallipadi 2007-02-05 16:12:45 -08:00 • committed by Dave Jones

parent 529af7a14f

commit 56463b78cd

1 changed files with 16 additions and 18 deletions

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drivers/cpufreq/cpufreq_ondemand.c

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