leds: mlxreg: Use devm_mutex_init() for mutex initialization

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.

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Linux kernel 安全漏洞

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于leds:mlxreg模块中在驱动程序的移除过程中，LED类的注销函数调用模块的led_set_brightness()关闭LEDs，该回调使用已经在模块的remove()中销毁的互斥锁。

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