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We need to take serio->drv_mutex in serio_cleanup() to prevent the function from being called while driver is in the middle of attaching to a serio port. Such situation can happen with i8042 and atkbd drivers if user rapidly presses Ctrl-Alt-Del during system startup, and leads to kernel oops. Reported-by: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>