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[CPUFREQ] revert "[CPUFREQ] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site)" 

395913d0b1 ("[CPUFREQ] remove rwsem lock
from CPUFREQ_GOV_STOP call (second call site)") is not needed, because
there is no rwsem lock in cpufreq_ondemand and cpufreq_conservative
anymore.  Lock should not be released until the work done.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=1594

Signed-off-by: Andrej Gelenberg <andrej.gelenberg@udo.edu>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Andrej Gelenberg 2010-05-14 15:15:58 -07:00 committed by Dave Jones
parent dbbe4649d6
commit accd846698
1 changed files with 1 additions and 10 deletions
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11
drivers/cpufreq/cpufreq.c
View File

@ -1762,17 +1762,8 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
dprintk("governor switch\n");
/* end old governor */
if (data->governor) {
/*
* Need to release the rwsem around governor
* stop due to lock dependency between
* cancel_delayed_work_sync and the read lock
* taken in the delayed work handler.
*/
unlock_policy_rwsem_write(data->cpu);
if (data->governor)
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
lock_policy_rwsem_write(data->cpu);
}
/* start new governor */
data->governor = policy->governor;