4.14-stable review patch.  If anyone has any objections, please let me know.


From: Ming Lei <ming....@redhat.com>

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.vale...@linaro.org>
Cc: Omar Sandoval <osan...@fb.com>
Cc: sta...@vger.kernel.org
Reviewed-by: Bart Van Assche <bart.vanass...@wdc.com>
Signed-off-by: Ming Lei <ming....@redhat.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 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,

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