void rds_shutdown_worker(struct work_struct *work)
{
struct rds_connection *conn = container_of(work, struct rds_connection, c_down_w);
/* 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(&conn->c_conn_w);
if (!hlist_unhashed(&conn->c_hash_node))
rds_queue_reconnect(conn);
}
void rds_shutdown_worker(struct work_struct *work)
{
struct rds_connection *conn = container_of(work, struct rds_connection, c_down_w);
if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_DOWN)) {
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)) {
rds_conn_error(conn,
"%s: failed to transition to state DOWN, "
"current state is %d\n",
__func__,
atomic_read(&conn->c_state));
return;
}
}
cancel_delayed_work(&conn->c_conn_w);
if (!hlist_unhashed(&conn->c_hash_node))
rds_queue_reconnect(conn);
}
