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authorDean Jenkins <Dean_Jenkins@mentor.com>2015-06-23 16:59:33 (GMT)
committerMarcel Holtmann <marcel@holtmann.org>2015-07-23 15:10:51 (GMT)
commitf65468f6e26c3bd05e642e10e80a485b99b7de05 (patch)
treeacf84d5f1bf435c379c78ac51fc6a43b9b990c45 /net/bluetooth
parent2baea85dec1aebe0b100d4836dee8bcf29a51e94 (diff)
Bluetooth: Make __l2cap_wait_ack more efficient
Use chan->state instead of chan->conn because waiting for ACK's is only possible in the BT_CONNECTED state. Also avoids reference to the conn structure so makes locking easier. Only call __l2cap_wait_ack() when the needed condition of chan->unacked_frames > 0 && chan->state == BT_CONNECTED is true and convert the while loop to a do while loop. __l2cap_wait_ack() change the function prototype to pass in the chan variable as chan is already available in the calling function l2cap_sock_shutdown(). Avoids locking issues. Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/l2cap_sock.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 3794c23..2904288 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1054,16 +1054,15 @@ static void l2cap_sock_kill(struct sock *sk)
sock_put(sk);
}
-static int __l2cap_wait_ack(struct sock *sk)
+static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
{
- struct l2cap_chan *chan = l2cap_pi(sk)->chan;
DECLARE_WAITQUEUE(wait, current);
int err = 0;
int timeo = HZ/5;
add_wait_queue(sk_sleep(sk), &wait);
set_current_state(TASK_INTERRUPTIBLE);
- while (chan->unacked_frames > 0 && chan->conn) {
+ do {
if (!timeo)
timeo = HZ/5;
@@ -1080,7 +1079,10 @@ static int __l2cap_wait_ack(struct sock *sk)
err = sock_error(sk);
if (err)
break;
- }
+
+ } while (chan->unacked_frames > 0 &&
+ chan->state == BT_CONNECTED);
+
set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
return err;
@@ -1115,8 +1117,10 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
lock_sock(sk);
if (!sk->sk_shutdown) {
- if (chan->mode == L2CAP_MODE_ERTM)
- err = __l2cap_wait_ack(sk);
+ if (chan->mode == L2CAP_MODE_ERTM &&
+ chan->unacked_frames > 0 &&
+ chan->state == BT_CONNECTED)
+ err = __l2cap_wait_ack(sk, chan);
sk->sk_shutdown = SHUTDOWN_MASK;

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