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thermal: Validate new state in cur_state_store()

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In cur_state_store(), the new state of the cooling device is received
from user-space and is not validated by the thermal core but the same is
left for the individual drivers to take care of. Apart from duplicating
the code it leaves possibility for introducing bugs where a driver may
not do it right.

Lets make the thermal core check the new state itself and store the max
value in the cooling device structure.

Link: https://lore.kernel.org/all/Y0ltRJRjO7AkawvE@kili/
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
2022-10-17 15:33:01 +05:30
committed by Rafael J. Wysocki
parent 247f34f7b8
commit c408b3d1d9
4 changed files with 14 additions and 19 deletions
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include/linux/thermal.h
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@@ -100,6 +100,7 @@ struct thermal_cooling_device_ops {
struct thermal_cooling_device {
int id;
char *type;
unsigned long max_state;
struct device device;
struct device_node *np;
void *devdata;