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| author | Gustavo F. Padovan <padovan@profusion.mobi> | 2010-05-05 04:16:01 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2010-05-10 09:28:53 +0200 |
| commit | 844c0972427ee5f661158160aaca10b22b3dda60 (patch) | |
| tree | b4e7694efc8dbfbc88ecfcca97a2381f0144c046 /net/bluetooth/l2cap.c | |
| parent | Bluetooth: Prevents buffer overflow on l2cap_ertm_reassembly_sdu() (diff) | |
| download | linux-844c0972427ee5f661158160aaca10b22b3dda60.tar.xz linux-844c0972427ee5f661158160aaca10b22b3dda60.zip | |
Bluetooth: Fix spec error in the RemoteBusy Logic
On the receipt of an RR(P=1) under RemoteBusy set to TRUE(on the RECV
state table) we have to call sendIorRRorRNR(F=1) and just after set
RemoteBusy to False. This leads to a freeze in the sending process since
it's not allowed send data with RemoteBusy set to true and no one
call SendPending-I-Frames after set RemoteBusy to false(The last action
for that event).
Actually sendIorRRorRNR() calls SendPending-I-Frames but at that moment
RemoteBusy is still True and we cannot send any frame, after, no one
calls SendPending-I-Frames again and the sending process stops.
The solution here is to set RemoteBusy to false inside
SendPending-I-Frames just before call SendPending-I-Frames. That will
make SendPending-I-Frames able to send frames. This solution is similar
to what RR(P=0)(F=0) on the RECV table and RR(P=1) on the SREJ_SENT
table do.
Actually doesn't make any sense call SendPending-I-Frames if we can send
any frame, i. e., RemoteBusy is True.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to '')
| -rw-r--r-- | net/bluetooth/l2cap.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index 9ef01c32b3a2..ba49f9a3579e 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -3379,6 +3379,8 @@ 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); @@ -3936,7 +3938,6 @@ static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) l2cap_send_srejtail(sk); } else { l2cap_send_i_or_rr_or_rnr(sk); - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; } } else if (rx_control & L2CAP_CTRL_FINAL) { |