IB/srp: Don't wait for disconnection if sending DREQ fails

Sending a DREQ may fail, for example because the remote target has
already broken the connection.  If so, then SRP should not wait for
the disconnection to complete, because it never will.
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/srp/ib_srp.c

@@ -340,7 +340,10 @@ static void srp_disconnect_target(struct srp_target_port *target)
 	/* XXX should send SRP_I_LOGOUT request */
 
 	init_completion(&target->done);
-	ib_send_cm_dreq(target->cm_id, NULL, 0);
+	if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
+		printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
+		return;
+	}
 	wait_for_completion(&target->done);
 }