IB/iser: Allow bind only when connection state is UP

We need to fail the bind operation if the iser connection state != UP
(started teardown) and this should be done under the state lock.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 61ee91d..93ce62f 100644 (file)
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -344,7 +344,6 @@ iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
                     int is_leading)
 {
        struct iscsi_conn *conn = cls_conn->dd_data;
-       struct iscsi_session *session;
        struct iser_conn *ib_conn;
        struct iscsi_endpoint *ep;
        int error;
@@ -363,9 +362,17 @@ iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
        }
        ib_conn = ep->dd_data;
 
-       session = conn->session;
-       if (iser_alloc_rx_descriptors(ib_conn, session))
-               return -ENOMEM;
+       mutex_lock(&ib_conn->state_mutex);
+       if (ib_conn->state != ISER_CONN_UP) {
+               error = -EINVAL;
+               iser_err("iser_conn %p state is %d, teardown started\n",
+                        ib_conn, ib_conn->state);
+               goto out;
+       }
+
+       error = iser_alloc_rx_descriptors(ib_conn, conn->session);
+       if (error)
+               goto out;
 
        /* binds the iSER connection retrieved from the previously
         * connected ep_handle to the iSCSI layer connection. exchanges
@@ -375,7 +382,9 @@ iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
        conn->dd_data = ib_conn;
        ib_conn->iscsi_conn = conn;
 
-       return 0;
+out:
+       mutex_unlock(&ib_conn->state_mutex);
+       return error;
 }
 
 static int