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Bluetooth: rfcomm: Fix lost wakeups waiting to accept socket 

Fix race conditions which can cause lost wakeups (or missed
signals) while waiting to accept an rfcomm socket connection.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Peter Hurley 2011-07-24 00:10:41 -04:00 committed by Gustavo F. Padovan
parent e5842cdb0f
commit 950e2d51e8
1 changed files with 15 additions and 15 deletions
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30
net/bluetooth/rfcomm/sock.c
View File

@ -485,11 +485,6 @@ static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int f
lock_sock(sk);
if (sk->sk_state != BT_LISTEN) {
err = -EBADFD;
goto done;
}
if (sk->sk_type != SOCK_STREAM) {
err = -EINVAL;
goto done;
@ -501,28 +496,33 @@ static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int f
/* Wait for an incoming connection. (wake-one). */
add_wait_queue_exclusive(sk_sleep(sk), &wait);
while (!(nsk = bt_accept_dequeue(sk, newsock))) {
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
if (!timeo) {
err = -EAGAIN;
break;
}
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
if (sk->sk_state != BT_LISTEN) {
err = -EBADFD;
break;
}
nsk = bt_accept_dequeue(sk, newsock);
if (nsk)
break;
if (!timeo) {
err = -EAGAIN;
break;
}
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
break;
}
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
}
set_current_state(TASK_RUNNING);
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
if (err)