RDS: move rds_shutdown_worker impl. to rds_conn_shutdown
This fits better in connection.c, rather than threads.c.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
diff --git a/net/rds/connection.c b/net/rds/connection.c
index 7619b67..895e39c 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -263,6 +263,59 @@
}
EXPORT_SYMBOL_GPL(rds_conn_create_outgoing);
+void rds_conn_shutdown(struct rds_connection *conn)
+{
+ /* shut it down unless it's down already */
+ if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_DOWN)) {
+ /*
+ * Quiesce the connection mgmt handlers before we start tearing
+ * things down. We don't hold the mutex for the entire
+ * duration of the shutdown operation, else we may be
+ * deadlocking with the CM handler. Instead, the CM event
+ * handler is supposed to check for state DISCONNECTING
+ */
+ mutex_lock(&conn->c_cm_lock);
+ if (!rds_conn_transition(conn, RDS_CONN_UP, RDS_CONN_DISCONNECTING)
+ && !rds_conn_transition(conn, RDS_CONN_ERROR, RDS_CONN_DISCONNECTING)) {
+ rds_conn_error(conn, "shutdown called in state %d\n",
+ atomic_read(&conn->c_state));
+ mutex_unlock(&conn->c_cm_lock);
+ return;
+ }
+ mutex_unlock(&conn->c_cm_lock);
+
+ mutex_lock(&conn->c_send_lock);
+ conn->c_trans->conn_shutdown(conn);
+ rds_conn_reset(conn);
+ mutex_unlock(&conn->c_send_lock);
+
+ if (!rds_conn_transition(conn, RDS_CONN_DISCONNECTING, RDS_CONN_DOWN)) {
+ /* This can happen - eg when we're in the middle of tearing
+ * down the connection, and someone unloads the rds module.
+ * Quite reproduceable with loopback connections.
+ * Mostly harmless.
+ */
+ rds_conn_error(conn,
+ "%s: failed to transition to state DOWN, "
+ "current state is %d\n",
+ __func__,
+ atomic_read(&conn->c_state));
+ return;
+ }
+ }
+
+ /* Then reconnect if it's still live.
+ * The passive side of an IB loopback connection is never added
+ * to the conn hash, so we never trigger a reconnect on this
+ * conn - the reconnect is always triggered by the active peer. */
+ cancel_delayed_work_sync(&conn->c_conn_w);
+ if (!hlist_unhashed(&conn->c_hash_node))
+ rds_queue_reconnect(conn);
+}
+
+/*
+ * Stop and free a connection.
+ */
void rds_conn_destroy(struct rds_connection *conn)
{
struct rds_message *rm, *rtmp;