smc: convert to ->poll_mask

smc->clcsock is an internal TCP socket, after TCP socket
converts to ->poll_mask, ->poll doesn't exist any more.
So just convert smc socket to ->poll_mask too.

Fixes: 2c7d3da ("net/tcp: convert to ->poll_mask")
Reported-by: syzbot+f5066e369b2d5fff630f@syzkaller.appspotmail.com
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/smc/af_smc.c

@@ -1273,8 +1273,7 @@ static __poll_t smc_accept_poll(struct sock *parent)
  return mask;
 }
 
-static __poll_t smc_poll(struct file *file, struct socket *sock,
- poll_table *wait)
+static __poll_t smc_poll_mask(struct socket *sock, __poll_t events)
 {
  struct sock *sk = sock->sk;
  __poll_t mask = 0;
@@ -1290,7 +1289,7 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
  if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
  /* delegate to CLC child sock */
  release_sock(sk);
- mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
+ mask = smc->clcsock->ops->poll_mask(smc->clcsock, events);
  lock_sock(sk);
  sk->sk_err = smc->clcsock->sk->sk_err;
  if (sk->sk_err) {
@@ -1308,11 +1307,6 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
  }
  }
  } else {
- if (sk->sk_state != SMC_CLOSED) {
- release_sock(sk);
- sock_poll_wait(file, sk_sleep(sk), wait);
- lock_sock(sk);
- }
  if (sk->sk_err)
  mask |= EPOLLERR;
  if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
@@ -1625,7 +1619,7 @@ static const struct proto_ops smc_sock_ops = {
  .socketpair = sock_no_socketpair,
  .accept = smc_accept,
  .getname = smc_getname,
- .poll = smc_poll,
+ .poll_mask = smc_poll_mask,
  .ioctl = smc_ioctl,
  .listen = smc_listen,
  .shutdown = smc_shutdown,