thermal: devfreq: Check OPP for errors
It is possible for dev_pm_opp_find_freq_exact() to return errors. It was
all fine earlier as dev_pm_opp_get_voltage() had a check within it to
check for invalid OPPs, but dev_pm_opp_put() doesn't have any similar
checks and the callers need to make sure OPP is valid before calling
them.
Also update the later dev_warn_ratelimited() to not print the error
message as the OPP is guaranteed to be valid now.
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Viresh Kumar <[email protected]>
Signed-off-by: Zhang Rui <[email protected]>
diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c
index e99d0e0..4bf4ad5 100644
--- a/drivers/thermal/devfreq_cooling.c
+++ b/drivers/thermal/devfreq_cooling.c
@@ -189,13 +189,19 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
if (PTR_ERR(opp) == -ERANGE)
opp = dev_pm_opp_find_freq_exact(dev, freq, false);
+ if (IS_ERR(opp)) {
+ dev_err_ratelimited(dev, "Failed to find OPP for frequency %lu: %ld\n",
+ freq, PTR_ERR(opp));
+ return 0;
+ }
+
voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_err_ratelimited(dev,
- "Failed to get voltage for frequency %lu: %ld\n",
- freq, IS_ERR(opp) ? PTR_ERR(opp) : 0);
+ "Failed to get voltage for frequency %lu\n",
+ freq);
return 0;
}
