From 3ea3217cf91804be6ed9b368ef4ac7911eb1dadc Mon Sep 17 00:00:00 2001
From: Viresh Kumar <viresh.kumar@linaro.org>
Date: Tue, 7 Feb 2017 09:40:05 +0530
Subject: [PATCH] thermal: cpu_cooling: 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 <dan.carpenter@oracle.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
drivers/thermal/cpu_cooling.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 59f0bd53f329e..69d0f430b2d19 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -393,13 +393,20 @@ static int get_static_power(struct cpufreq_cooling_device *cpufreq_device,
opp = dev_pm_opp_find_freq_exact(cpufreq_device->cpu_dev, freq_hz,
true);
+ if (IS_ERR(opp)) {
+ dev_warn_ratelimited(cpufreq_device->cpu_dev,
+ "Failed to find OPP for frequency %lu: %ld\n",
+ freq_hz, PTR_ERR(opp));
+ return -EINVAL;
+ }
+
voltage = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_err_ratelimited(cpufreq_device->cpu_dev,
- "Failed to get voltage for frequency %lu: %ld\n",
- freq_hz, IS_ERR(opp) ? PTR_ERR(opp) : 0);
+ "Failed to get voltage for frequency %lu\n",
+ freq_hz);
return -EINVAL;
}
--
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