It's unnecessary to set the same freq again and run notifier calls.
Signed-off-by: Dong Aisheng <[email protected]>
---
drivers/devfreq/devfreq.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index b537fd9602cd..cacda7d1f858 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -403,13 +403,16 @@ static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
{
struct devfreq_freqs freqs;
unsigned long cur_freq;
- int err = 0;
+ int err;
if (devfreq->profile->get_cur_freq)
devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_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);
@@ -426,7 +429,7 @@ 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);
devfreq_update_transitions(devfreq, cur_freq, new_freq,
@@ -445,7 +448,7 @@ static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
if (devfreq->suspend_freq)
devfreq->resume_freq = new_freq;
- return err;
+ return 0;
}
/**
--
2.25.1