It's unnecessary to set the same freq again and run notifier calls.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
  drivers/devfreq/devfreq.c | 5 ++++-
  1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index bf3047896e41..6e80bf70e7b3 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c

@@ -358,6 +358,9 @@ static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
  	else
  		cur_freq = devfreq->previous_freq;
  
+	if (new_freq == cur_freq)
+		return 0;
+
  	freqs.old = cur_freq;
  	freqs.new = new_freq;
  	devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);

@@ -374,7 +377,7 @@ static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
  	 * and DEVFREQ_POSTCHANGE because for showing the correct frequency
  	 * change order of between devfreq device and passive devfreq device.
  	 */
-	if (trace_devfreq_frequency_enabled() && new_freq != cur_freq)
+	if (trace_devfreq_frequency_enabled())
  		trace_devfreq_frequency(devfreq, new_freq, cur_freq);
  
  	freqs.new = new_freq;