IB/iser: Seperate iser_conn and iscsi_endpoint storage space

iser connection needs asynchronous cleanup completions which are
triggered in ep_disconnect.  As a result we are keeping the
corresponding iscsi_endpoint structure hanging for no good reason. In
order to avoid that, we seperate iser_conn from iscsi_endpoint storage
space to have their destruction being independent.

iscsi_endpoint will be destroyed at ep_disconnect stage, while the
iser connection will wait for asynchronous completions to be released
in an orderly fashion.

Signed-off-by: Ariel Nahum <arieln@mellanox.com>
Signed-off-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/ulp/iser/iscsi_iser.c

@@ -596,19 +596,28 @@ iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
 	struct iser_conn *ib_conn;
 	struct iscsi_endpoint *ep;
 
-	ep = iscsi_create_endpoint(sizeof(*ib_conn));
+	ep = iscsi_create_endpoint(0);
 	if (!ep)
 		return ERR_PTR(-ENOMEM);
 
-	ib_conn = ep->dd_data;
+	ib_conn = kzalloc(sizeof(*ib_conn), GFP_KERNEL);
+	if (!ib_conn) {
+		err = -ENOMEM;
+		goto failure;
+	}
+
+	ep->dd_data = ib_conn;
 	ib_conn->ep = ep;
 	iser_conn_init(ib_conn);
 
 	err = iser_connect(ib_conn, NULL, dst_addr, non_blocking);
 	if (err)
-		return ERR_PTR(err);
+		goto failure;
 
 	return ep;
+failure:
+	iscsi_destroy_endpoint(ep);
+	return ERR_PTR(err);
 }
 
 static int
@@ -658,6 +667,7 @@ iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 	} else {
 		iser_conn_release(ib_conn);
 	}
+	iscsi_destroy_endpoint(ep);
 }
 
 static umode_t iser_attr_is_visible(int param_type, int param)

drivers/infiniband/ulp/iser/iser_verbs.c

@@ -620,7 +620,7 @@ void iser_conn_release(struct iser_conn *ib_conn)
 		rdma_destroy_id(ib_conn->cma_id);
 		ib_conn->cma_id = NULL;
 	}
-	iscsi_destroy_endpoint(ib_conn->ep);
+	kfree(ib_conn);
 }
 
 /**