s390/zcrypt: fix possible deadlock situation on ap queue remove
With commit 01396a37 ("s390/zcrypt: revisit ap device remove procedure") the ap queue remove is now a two stage process. However, a del_timer_sync() call may trigger the timer function which may try to lock the very same spinlock as is held by the function just initiating the del_timer_sync() call. This could end up in a deadlock situation. Very unlikely but possible as you need to remove an ap queue at the exact sime time when a timeout of a request occurs. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Reported-by: Pierre Morel <pmorel@linux.ibm.com> Fixes: commit 01396a37 ("s390/zcrypt: revisit ap device remove procedure") Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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