From 6e2b6722abaa3f6042357e11f465488b7c12f94c Mon Sep 17 00:00:00 2001 From: "Gustavo F. Padovan" Date: Tue, 1 Jun 2010 18:52:58 -0300 Subject: [PATCH] Bluetooth: Fix bug in l2cap_ertm_send() behavior MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This patch makes l2cap_ertm_send() similar to the Send-Data action of the ERTM spec. We shall not check for RemoteBusy or WAIT_F state inside l2cap_ertm_send(). Such checks were causing a bug in the retransmission logic of ERTM and making ERTM stalls until the ACL is dropped. Signed-off-by: Gustavo F. Padovan Reviewed-by: João Paulo Rechi Vita Signed-off-by: Marcel Holtmann --- net/bluetooth/l2cap.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index 108c2f290ac5..69f098d98141 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -1415,11 +1415,8 @@ static int l2cap_ertm_send(struct sock *sk) u16 control, fcs; int nsent = 0; - if (pi->conn_state & L2CAP_CONN_WAIT_F) - return 0; - while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) && - !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) { + while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { if (pi->remote_max_tx && bt_cb(skb)->retries == pi->remote_max_tx) { @@ -1792,6 +1789,11 @@ static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct ms if (pi->mode == L2CAP_MODE_STREAMING) { err = l2cap_streaming_send(sk); } else { + if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && + pi->conn_state && L2CAP_CONN_WAIT_F) { + err = len; + break; + } spin_lock_bh(&pi->send_lock); err = l2cap_ertm_send(sk); spin_unlock_bh(&pi->send_lock); @@ -3378,8 +3380,6 @@ static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0) __mod_retrans_timer(); - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - spin_lock_bh(&pi->send_lock); l2cap_ertm_send(sk); spin_unlock_bh(&pi->send_lock); -- 2.39.2