leds: mlxreg: Use devm_mutex_init() for mutex initialization

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: leds: mlxreg: Use devm_mutex_init() for mutex initialization In this driver LEDs are registered using devm_led_classdev_register() so they are automatically unregistered after module's remove() is done. led_classdev_unregister() calls module's led_set_brightness() to turn off the LEDs and that callback uses mutex which was destroyed already in module's remove() so use devm API instead.

References

• https://git.kernel.org/stable/c/618c6ce83471ab4f7ac744d27b9d03af173bc141
• https://git.kernel.org/stable/c/172ffd26a5af13e951d0e82df7cfc5a95b04fa80
• https://git.kernel.org/stable/c/3b62888307ae44b68512d3f7735c26a4c8e45b51
• https://git.kernel.org/stable/c/efc347b9efee1c2b081f5281d33be4559fa50a16