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authorDaniel Lezcano <daniel.lezcano@linaro.org>2020-03-21 22:31:07 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2020-03-23 17:20:47 +0300
commit40ea568593f20647e7d58deb7fcfa69b11a37d8b (patch)
treebafe1406cb9984cf802bd80e4731ea4c806f7026 /drivers/thermal
parentff44f672d74178b3be19d41a169b98b3e391d4ce (diff)
downloadlinux-40ea568593f20647e7d58deb7fcfa69b11a37d8b.tar.xz
thermal/drivers/cpufreq_cooling: Remove abusing WARN_ON
The WARN_ON macros are used at the entry functions state2power() and set_cur_state(). state2power() is called with the max_state retrieved from get_max_state which returns cpufreq_cdev->max_level, then it check if max_state is > cpufreq_cdev->max_level. The test does not really makes sense but let's assume we want to make sure to catch an error if the code evolves. However the WARN_ON is overkill. set_cur_state() is also called from userspace if we write to the sysfs. It is easy to see a stack dumped by just writing to sysfs /sys/class/thermal/cooling_device0/cur_state a value greater than "max_level". A bit scary. Returing -EINVAL is enough. Remove these WARN_ON. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Link: https://lore.kernel.org/r/20200321193107.21590-1-daniel.lezcano@linaro.org
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/cpufreq_cooling.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
index af55ac08e1bd..d66791a71320 100644
--- a/drivers/thermal/cpufreq_cooling.c
+++ b/drivers/thermal/cpufreq_cooling.c
@@ -273,7 +273,7 @@ static int cpufreq_state2power(struct thermal_cooling_device *cdev,
struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
/* Request state should be less than max_level */
- if (WARN_ON(state > cpufreq_cdev->max_level))
+ if (state > cpufreq_cdev->max_level)
return -EINVAL;
num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus);
@@ -434,7 +434,7 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
int ret;
/* Request state should be less than max_level */
- if (WARN_ON(state > cpufreq_cdev->max_level))
+ if (state > cpufreq_cdev->max_level)
return -EINVAL;
/* Check if the old cooling action is same as new cooling action */