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rxrpc: Provide more refcount helper functions

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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>
This commit is contained in:
David Howells
2016-04-04 14:00:38 +01:00
parent 985a5c824a
commit 5627cc8b96
8 changed files with 26 additions and 18 deletions
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15
net/rxrpc/ar-internal.h
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@@ -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);
}