4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ming Lei <ming.lei@xxxxxxxxxx> commit ba989a01469d027861e55c8f1121edadef757797 upstream. When requeuing request, the domain token should have been freed before re-inserting the request to io scheduler. Otherwise, the assigned domain token will be leaked, and IO hang can be caused. Cc: Paolo Valente <paolo.valente@xxxxxxxxxx> Cc: Omar Sandoval <osandov@xxxxxx> Cc: stable@xxxxxxxxxxxxxxx Reviewed-by: Bart Van Assche <bart.vanassche@xxxxxxx> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- block/kyber-iosched.c | 1 + 1 file changed, 1 insertion(+) --- a/block/kyber-iosched.c +++ b/block/kyber-iosched.c @@ -814,6 +814,7 @@ static struct elevator_type kyber_sched .limit_depth = kyber_limit_depth, .prepare_request = kyber_prepare_request, .finish_request = kyber_finish_request, + .requeue_request = kyber_finish_request, .completed_request = kyber_completed_request, .dispatch_request = kyber_dispatch_request, .has_work = kyber_has_work,