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net: don not detour through struct sock to find the poll waitqueue 

For any open socket file descriptor sock->sk->sk_wq->wait will always
point to sock->wq->wait.  That means we can do the shorter dereference
and removal a NULL check and don't have to not worry about any RCU
protection.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2018-07-30 09:42:11 +02:00 committed by David S. Miller
parent dd979b4df8
commit d8bbd13bee
1 changed files with 2 additions and 3 deletions
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5
include/net/sock.h
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@ -2064,10 +2064,9 @@ static inline bool skwq_has_sleeper(struct socket_wq *wq)
static inline void sock_poll_wait(struct file *filp, poll_table *p)
{
struct socket *sock = filp->private_data;
wait_queue_head_t *wq = sk_sleep(sock->sk);
if (!poll_does_not_wait(p) && wq) {
poll_wait(filp, wq, p);
if (!poll_does_not_wait(p)) {
poll_wait(filp, &sock->wq->wait, p);
/* We need to be sure we are in sync with the
* socket flags modification.
*