net/tcp: convert to ->poll_mask

void tcp_close(struct sock *sk, long timeout);

void tcp_init_sock(struct sock *sk);

void tcp_init_transfer(struct sock *sk, int bpf_op);

__poll_t tcp_poll(struct file *file, struct socket *sock,

		      struct poll_table_struct *wait);

__poll_t tcp_poll_mask(struct socket *sock, __poll_t events);

int tcp_getsockopt(struct sock *sk, int level, int optname,

		   char __user *optval, int __user *optlen);

int tcp_setsockopt(struct sock *sk, int level, int optname,

	.socketpair	   = sock_no_socketpair,

	.accept		   = inet_accept,

	.getname	   = inet_getname,

	.poll		   = tcp_poll,

	.poll_mask	   = tcp_poll_mask,

	.ioctl		   = inet_ioctl,

	.listen		   = inet_listen,

	.shutdown	   = inet_shutdown,

}

/*

 *	Wait for a TCP event.

 *

 *	Note that we don't need to lock the socket, as the upper poll layers

 *	take care of normal races (between the test and the event) and we don't

 *	go look at any of the socket buffers directly.

 * Socket is not locked. We are protected from async events by poll logic and

 * correct handling of state changes made by other threads is impossible in

 * any case.

 */

__poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait)

__poll_t tcp_poll_mask(struct socket *sock, __poll_t events)

{

	__poll_t mask;

	struct sock *sk = sock->sk;

	const struct tcp_sock *tp = tcp_sk(sk);

	__poll_t mask = 0;

	int state;

	sock_poll_wait(file, sk_sleep(sk), wait);

	state = inet_sk_state_load(sk);

	if (state == TCP_LISTEN)

		return inet_csk_listen_poll(sk);

	/* Socket is not locked. We are protected from async events

	 * by poll logic and correct handling of state changes

	 * made by other threads is impossible in any case.

	 */

	mask = 0;

	/*

	 * EPOLLHUP is certainly not done right. But poll() doesn't

	 * have a notion of HUP in just one direction, and for a

	return mask;

}

EXPORT_SYMBOL(tcp_poll);

EXPORT_SYMBOL(tcp_poll_mask);

int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)

{

	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/

	.accept		   = inet_accept,		/* ok		*/

	.getname	   = inet6_getname,

	.poll		   = tcp_poll,			/* ok		*/

	.poll_mask	   = tcp_poll_mask,		/* ok		*/

	.ioctl		   = inet6_ioctl,		/* must change  */

	.listen		   = inet_listen,		/* ok		*/

	.shutdown	   = inet_shutdown,		/* ok		*/