IB/srp: Fix memory leak on reconnect

SRP reallocates the IU buffers for tx_ring and rx_ring without freeing
the old buffers when it reconnects to a target.  Fix this by keeping
the old IU buffers around.

Signed-off-by: Vu Pham <vu@mellanox.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 613be2e..64ab5fc 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1176,9 +1176,11 @@
 			break;
 		}
 
-		target->status = srp_alloc_iu_bufs(target);
-		if (target->status)
-			break;
+		if (!target->rx_ring[0]) {
+			target->status = srp_alloc_iu_bufs(target);
+			if (target->status)
+				break;
+		}
 
 		qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
 		if (!qp_attr) {