Bluetooth: Simplify L2CAP Streaming mode sending

As we don't have any error control on the Streaming mode, i.e., we don't
need to keep a copy of the skb for later resending we don't need to
call skb_clone() on it.
Then we can go one further here, and dequeue the skb before sending it,
that also means we don't need to look to sk->sk_send_head anymore.

The patch saves memory and time when sending Streaming mode data, so
it is good to mainline.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 7 insertions, 17 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 9fad312e53f2..f2062aace406 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1441,33 +1441,23 @@ static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
 
 static void l2cap_streaming_send(struct sock *sk)
 {
-        struct sk_buff *skb, *tx_skb;
+        struct sk_buff *skb;
         struct l2cap_pinfo *pi = l2cap_pi(sk);
         u16 control, fcs;
 
-        while ((skb = sk->sk_send_head)) {
-                tx_skb = skb_clone(skb, GFP_ATOMIC);
-
-                control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
+        while ((skb = skb_dequeue(TX_QUEUE(sk)))) {
+                control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
                 control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
-                put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
+                put_unaligned_le16(control, 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);
+                        fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
+                        put_unaligned_le16(fcs, skb->data + skb->len - 2);
                 }
 
-                l2cap_do_send(sk, tx_skb);
+                l2cap_do_send(sk, skb);
 
                 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
-
-                if (skb_queue_is_last(TX_QUEUE(sk), skb))
-                        sk->sk_send_head = NULL;
-                else
-                        sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
-
-                skb = skb_dequeue(TX_QUEUE(sk));
-                kfree_skb(skb);
         }
 }