diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2011-07-24 00:11:01 -0400 |
|---|---|---|
| committer | Gustavo F. Padovan <padovan@profusion.mobi> | 2011-08-11 19:50:26 -0300 |
| commit | 552b0d3cb9ff648aa503011ef50ca24019cd0f5f (patch) | |
| tree | b9ae549982b6768f6792fa99c1aa816ae8c8f819 /net/bluetooth/sco.c | |
| parent | f9a3c20aa07462108fc6fd759dea956053f020bb (diff) | |
| download | lwn-552b0d3cb9ff648aa503011ef50ca24019cd0f5f.tar.gz lwn-552b0d3cb9ff648aa503011ef50ca24019cd0f5f.zip | |
Bluetooth: sco: Fix lost wakeups waiting to accept socket
Fix race conditions which can cause lost wakeups (or missed signals)
while waiting to accept a sco socket connection.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Diffstat (limited to 'net/bluetooth/sco.c')
| -rw-r--r-- | net/bluetooth/sco.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index 4c3621b5e0aa..8270f05e3f1f 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -564,30 +564,26 @@ static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flag lock_sock(sk); - if (sk->sk_state != BT_LISTEN) { - err = -EBADFD; - goto done; - } - timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); BT_DBG("sk %p timeo %ld", sk, timeo); /* Wait for an incoming connection. (wake-one). */ add_wait_queue_exclusive(sk_sleep(sk), &wait); - while (!(ch = bt_accept_dequeue(sk, newsock))) { + while (1) { set_current_state(TASK_INTERRUPTIBLE); - if (!timeo) { - err = -EAGAIN; + + if (sk->sk_state != BT_LISTEN) { + err = -EBADFD; break; } - release_sock(sk); - timeo = schedule_timeout(timeo); - lock_sock(sk); + ch = bt_accept_dequeue(sk, newsock); + if (ch) + break; - if (sk->sk_state != BT_LISTEN) { - err = -EBADFD; + if (!timeo) { + err = -EAGAIN; break; } @@ -595,8 +591,12 @@ static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flag 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) |