diff options
Diffstat (limited to 'include/net/inet_sock.h')
| -rw-r--r-- | include/net/inet_sock.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h index a3431a4ff9cc..0a671c32d6b9 100644 --- a/include/net/inet_sock.h +++ b/include/net/inet_sock.h @@ -290,9 +290,32 @@ static inline void inet_sk_copy_descendant(struct sock *sk_to, #endif int inet_sk_rebuild_header(struct sock *sk); -void inet_sk_set_state(struct sock *sk, int state); + +/** + * inet_sk_state_load - read sk->sk_state for lockless contexts + * @sk: socket pointer + * + * Paired with inet_sk_state_store(). Used in places we don't hold socket lock: + * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ... + */ +static inline int inet_sk_state_load(const struct sock *sk) +{ + /* state change might impact lockless readers. */ + return smp_load_acquire(&sk->sk_state); +} + +/** + * inet_sk_state_store - update sk->sk_state + * @sk: socket pointer + * @newstate: new state + * + * Paired with inet_sk_state_load(). Should be used in contexts where + * state change might impact lockless readers. + */ void inet_sk_state_store(struct sock *sk, int newstate); +void inet_sk_set_state(struct sock *sk, int state); + static inline unsigned int __inet_ehashfn(const __be32 laddr, const __u16 lport, const __be32 faddr, |