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

395913d0b1db37092ea3d9d69b832183b1dd84c5 ("[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>

1 files changed, 1 insertions, 10 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 063b2184caf5..8f22ce1ea684 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -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;