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 <dhowells@redhat.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index cfbd028aa551..c0ed5e7f22ef 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);
 }