From: David Howells Date: Mon, 4 Apr 2016 13:00:38 +0000 (+0100) Subject: rxrpc: Provide more refcount helper functions X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5627cc8b961e4b07d5d649d9bd01ac929dcc1a95;p=linux.git rxrpc: Provide more refcount helper functions Provide refcount helper functions for connections so that the code doesn't touch local or connection usage counts directly. Also make it such that local and peer put functions can take a NULL pointer. Signed-off-by: David Howells --- diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c index b29bb50af5de8..57dcbfc061e47 100644 --- a/net/rxrpc/af_rxrpc.c +++ b/net/rxrpc/af_rxrpc.c @@ -674,11 +674,8 @@ static int rxrpc_release_sock(struct sock *sk) flush_workqueue(rxrpc_workqueue); rxrpc_purge_queue(&sk->sk_receive_queue); - if (rx->local) { - rxrpc_put_local(rx->local); - rx->local = NULL; - } - + rxrpc_put_local(rx->local); + rx->local = NULL; key_put(rx->key); rx->key = NULL; key_put(rx->securities); diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h index cfbd028aa551e..c0ed5e7f22ef5 100644 --- a/net/rxrpc/ar-internal.h +++ b/net/rxrpc/ar-internal.h @@ -597,6 +597,17 @@ static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) return conn->proto.in_clientflag; } +static inline void rxrpc_get_connection(struct rxrpc_connection *conn) +{ + atomic_inc(&conn->usage); +} + +static inline +struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *conn) +{ + return atomic_inc_not_zero(&conn->usage) ? conn : NULL; +} + /* * input.c */ @@ -645,7 +656,7 @@ struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local) static inline void rxrpc_put_local(struct rxrpc_local *local) { - if (atomic_dec_and_test(&local->usage)) + if (local && atomic_dec_and_test(&local->usage)) __rxrpc_put_local(local); } @@ -702,7 +713,7 @@ struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer) extern void __rxrpc_put_peer(struct rxrpc_peer *peer); static inline void rxrpc_put_peer(struct rxrpc_peer *peer) { - if (atomic_dec_and_test(&peer->usage)) + if (peer && atomic_dec_and_test(&peer->usage)) __rxrpc_put_peer(peer); } diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c index 5a70dc4e28c6f..833ad0622b613 100644 --- a/net/rxrpc/call_accept.c +++ b/net/rxrpc/call_accept.c @@ -141,7 +141,7 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local, _debug("await conn sec"); list_add_tail(&call->accept_link, &rx->secureq); call->conn->state = RXRPC_CONN_SERVER_CHALLENGING; - atomic_inc(&call->conn->usage); + rxrpc_get_connection(call->conn); set_bit(RXRPC_CONN_CHALLENGE, &call->conn->events); rxrpc_queue_conn(call->conn); } else { diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c index d83f2cbb80a94..45849a66bc56a 100644 --- a/net/rxrpc/call_object.c +++ b/net/rxrpc/call_object.c @@ -515,7 +515,7 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, rb_insert_color(&call->conn_node, &conn->calls); conn->channels[call->channel] = call; sock_hold(&rx->sk); - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); write_unlock_bh(&conn->lock); spin_lock(&conn->params.peer->lock); diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c index a022439f6f5a3..bf6971555eace 100644 --- a/net/rxrpc/conn_event.c +++ b/net/rxrpc/conn_event.c @@ -263,7 +263,7 @@ void rxrpc_process_connection(struct work_struct *work) _enter("{%d}", conn->debug_id); - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); if (test_and_clear_bit(RXRPC_CONN_CHALLENGE, &conn->events)) { rxrpc_secure_connection(conn); diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c index 312b75091d29b..1754f2e2e16bf 100644 --- a/net/rxrpc/conn_object.c +++ b/net/rxrpc/conn_object.c @@ -333,7 +333,7 @@ static int rxrpc_connect_exclusive(struct rxrpc_sock *rx, * channel. */ chan = 0; - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); conn->avail_calls = RXRPC_MAXCALLS - 1; conn->channels[chan] = call; conn->call_counter = 1; @@ -392,7 +392,7 @@ int rxrpc_connect_call(struct rxrpc_sock *rx, conn->channels[1] == NULL || conn->channels[2] == NULL || conn->channels[3] == NULL); - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); break; } @@ -412,7 +412,7 @@ int rxrpc_connect_call(struct rxrpc_sock *rx, conn->channels[1] == NULL && conn->channels[2] == NULL && conn->channels[3] == NULL); - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); list_move(&conn->bundle_link, &bundle->avail_conns); break; } @@ -629,7 +629,7 @@ found_extant_connection: read_unlock_bh(&trans->conn_lock); goto security_mismatch; } - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); read_unlock_bh(&trans->conn_lock); goto success; @@ -639,7 +639,7 @@ found_extant_second: write_unlock_bh(&trans->conn_lock); goto security_mismatch; } - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); write_unlock_bh(&trans->conn_lock); kfree(candidate); goto success; @@ -698,7 +698,7 @@ struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans, return NULL; found: - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); read_unlock_bh(&trans->conn_lock); _leave(" = %p", conn); return conn; diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c index cf540efa9c174..799aec18aa7b2 100644 --- a/net/rxrpc/input.c +++ b/net/rxrpc/input.c @@ -580,7 +580,7 @@ static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, { _enter("%p,%p", conn, skb); - atomic_inc(&conn->usage); + rxrpc_get_connection(conn); skb_queue_tail(&conn->rx_queue, skb); rxrpc_queue_conn(conn); } diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c index 009b321712bc7..5703b0d18ed40 100644 --- a/net/rxrpc/local_object.c +++ b/net/rxrpc/local_object.c @@ -209,7 +209,7 @@ struct rxrpc_local *rxrpc_lookup_local(const struct sockaddr_rxrpc *srx) * bind the transport socket may still fail if we're attempting * to use a local address that the dying object is still using. */ - if (!atomic_inc_not_zero(&local->usage)) { + if (!rxrpc_get_local_maybe(local)) { cursor = cursor->next; list_del_init(&local->link); break;