Name
sk_wait_data —
wait for data to arrive at sk_receive_queue
Arguments
struct sock * sk
sock to wait on
long * timeo
for how long
const struct sk_buff * skb
last skb seen on sk_receive_queue
Description
Now socket state including sk->sk_err is changed only under lock,
hence we may omit checks after joining wait queue.
We check receive queue before schedule only as optimization;
it is very likely that release_sock added new data.