When the loopback timer handler is running, calling del_timer() (for STOP
trigger) will not wait for the handler to complete before deactivating the
timer. The timer gets rescheduled in the handler as usual. Then a subsequent
START trigger will try to start the timer using add_timer() with a timer pending
leading to a kernel panic.
Serialize the calls to add_timer() and del_timer() using a spin lock to avoid
this.
Signed-off-by: Omair Mohammed Abdullah <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
Cc: <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
d4f1e48bd1