IB/srp: Fail I/O fast if target offline

If reconnecting failed we know that no command completion will
be received anymore.  Hence let the SCSI error handler fail such
commands immediately.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/ulp/srp/ib_srp.c

@@ -1754,6 +1754,8 @@ static int srp_abort(struct scsi_cmnd *scmnd)
 			      SRP_TSK_ABORT_TASK) == 0 ||
 	    target->transport_offline)
 		ret = SUCCESS;
+	else if (target->transport_offline)
+		ret = FAST_IO_FAIL;
 	else
 		ret = FAILED;
 	srp_free_req(target, req, scmnd, 0);