From: Dong Aisheng <aisheng.dong@nxp.com>
Date: Tue, 9 Mar 2021 12:58:38 +0000 (+0800)
Subject: PM / devfreq: Check get_dev_status in devfreq_update_stats
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b19e13463a1054b1b51f4314a1a53da02aed776f;p=linux.git

PM / devfreq: Check get_dev_status in devfreq_update_stats

Check .get_dev_status() in devfreq_update_stats in case it's abused
when a device does not provide it.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---

diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
index 70f44b3ca42e6..2446344651704 100644
--- a/drivers/devfreq/governor.h
+++ b/drivers/devfreq/governor.h
@@ -91,6 +91,9 @@ int devfreq_update_target(struct devfreq *devfreq, unsigned long freq);
 
 static inline int devfreq_update_stats(struct devfreq *df)
 {
+	if (!df->profile->get_dev_status)
+		return -EINVAL;
+
 	return df->profile->get_dev_status(df->dev.parent, &df->last_status);
 }
 #endif /* _GOVERNOR_H */