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authorPeter Hurley <peter@hurleysoftware.com>2011-07-24 00:11:01 -0400
committerGustavo F. Padovan <padovan@profusion.mobi>2011-08-11 19:50:26 -0300
commit552b0d3cb9ff648aa503011ef50ca24019cd0f5f (patch)
treeb9ae549982b6768f6792fa99c1aa816ae8c8f819 /net
parentf9a3c20aa07462108fc6fd759dea956053f020bb (diff)
downloadlinux-linaro-stable-552b0d3cb9ff648aa503011ef50ca24019cd0f5f.tar.gz
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')
-rw-r--r--net/bluetooth/sco.c28
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)