[PATCH 10/13] Bluetooth: Fix crash when sending frames after connection is closed

["Gustavo F. Padovan" <padovan@profusion.mobi>]

At the time the channel is closed we can't really know if the timer
was really deleted, since we used del_timer(). We can't call
del_timer_sync() in interrupt context! So sometimes the acktimeout
expires and try to send a acknowledgement, but we don't have any
connection anymore.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
---
 net/bluetooth/l2cap.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 3db0078..e5b766d 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -345,8 +345,12 @@ static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
 	struct sk_buff *skb;
 	struct l2cap_hdr *lh;
 	struct l2cap_conn *conn = pi->conn;
+	struct sock *sk = (struct sock *)pi;
 	int count, hlen = L2CAP_HDR_SIZE + 2;
 
+	if (sk->sk_state != BT_CONNECTED)
+		return;
+
 	if (pi->fcs == L2CAP_FCS_CRC16)
 		hlen += 2;
 
-- 
1.6.4.4