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Bluetooth: Refactor l2cap_retransmit_frame() 

Make the code flow cleaner and changes the function to void.
It also fixes a potential NULL dereference with skb.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Gustavo F. Padovan 2010-05-01 16:15:44 -03:00 committed by Marcel Holtmann
parent 9a9c6a3441
commit f11d676da4
1 changed files with 27 additions and 26 deletions
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53
net/bluetooth/l2cap.c
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@ -1331,43 +1331,44 @@ static int l2cap_streaming_send(struct sock *sk)
return 0;
}
static int l2cap_retransmit_frame(struct sock *sk, u8 tx_seq)
static void l2cap_retransmit_frame(struct sock *sk, u8 tx_seq)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
struct sk_buff *skb, *tx_skb;
u16 control, fcs;
skb = skb_peek(TX_QUEUE(sk));
if (!skb)
return;
do {
if (bt_cb(skb)->tx_seq != tx_seq) {
if (skb_queue_is_last(TX_QUEUE(sk), skb))
break;
skb = skb_queue_next(TX_QUEUE(sk), skb);
continue;
}
if (pi->remote_max_tx &&
bt_cb(skb)->retries == pi->remote_max_tx) {
l2cap_send_disconn_req(pi->conn, sk);
if (bt_cb(skb)->tx_seq == tx_seq)
break;
}
tx_skb = skb_clone(skb, GFP_ATOMIC);
bt_cb(skb)->retries++;
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
| (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
if (skb_queue_is_last(TX_QUEUE(sk), skb))
return;
if (pi->fcs == L2CAP_FCS_CRC16) {
fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
}
} while ((skb = skb_queue_next(TX_QUEUE(sk), skb)));
l2cap_do_send(sk, tx_skb);
break;
} while(1);
return 0;
if (pi->remote_max_tx &&
bt_cb(skb)->retries == pi->remote_max_tx) {
l2cap_send_disconn_req(pi->conn, sk);
return;
}
tx_skb = skb_clone(skb, GFP_ATOMIC);
bt_cb(skb)->retries++;
control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
| (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
if (pi->fcs == L2CAP_FCS_CRC16) {
fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
}
l2cap_do_send(sk, tx_skb);
}
static int l2cap_ertm_send(struct sock *sk)