thinkpad-acpi: kill hotkey_thread_mutex

hotkey_kthread() does try_to_freeze() under hotkey_thread_mutex.

We can simply kill this mutex, hotkey_poll_stop_sync() does not need to
serialize with hotkey_kthread().  When kthread_stop() returns the thread
is already dead, it called do_exit()->complete_vfork_done().

Reported-by: Artem Savkov <[email protected]>
Reported-by: Maciej Rutecki <[email protected]>
Signed-off-by: Oleg Nesterov <[email protected]>
Acked-by: Henrique de Moraes Holschuh <[email protected]>
Cc: Matthew Garrett <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Reviewed-by: Mandeep Singh Baines <[email protected]>
Cc: Aaron Lu <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions