net: sk_sleep() helper

Define a new function to return the waitqueue of a "struct sock".

static inline wait_queue_head_t *sk_sleep(struct sock *sk)
{
	return sk->sk_sleep;
}

Change all read occurrences of sk_sleep by a call to this function.

Needed for a future RCU conversion. sk_sleep wont be a field directly
available.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c
index 0073ec8..d4c6af0 100644
--- a/net/bluetooth/cmtp/core.c
+++ b/net/bluetooth/cmtp/core.c
@@ -284,7 +284,7 @@
 	set_user_nice(current, -15);
 
 	init_waitqueue_entry(&wait, current);
-	add_wait_queue(sk->sk_sleep, &wait);
+	add_wait_queue(sk_sleep(sk), &wait);
 	while (!atomic_read(&session->terminate)) {
 		set_current_state(TASK_INTERRUPTIBLE);
 
@@ -301,7 +301,7 @@
 		schedule();
 	}
 	set_current_state(TASK_RUNNING);
-	remove_wait_queue(sk->sk_sleep, &wait);
+	remove_wait_queue(sk_sleep(sk), &wait);
 
 	down_write(&cmtp_session_sem);