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 (file)
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1176,9 +1176,11 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
                        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) {