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>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 613be2ef9c52..64ab5fc7cca3 100644
--- 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) {