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Bluetooth: SCO: Replace use of memcpy_from_msg with bt_skb_sendmsg

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commit 0771cbb3b97d3c1d68eecd7f00055f599954c34e upstream.

This makes use of bt_skb_sendmsg instead of allocating a different
buffer to be used with memcpy_from_msg which cause one extra copy.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luiz Augusto von Dentz 2021-09-03 15:27:31 -07:00 committed by Greg Kroah-Hartman
parent c8ca1084e7
commit c5f6a8542d
1 changed files with 11 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
net/bluetooth/sco.c
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@ -279,27 +279,19 @@ static int sco_connect(struct hci_dev *hdev, struct sock *sk)
return err;
}
static int sco_send_frame(struct sock *sk, void *buf, int len,
unsigned int msg_flags)
static int sco_send_frame(struct sock *sk, struct sk_buff *skb)
{
struct sco_conn *conn = sco_pi(sk)->conn;
struct sk_buff *skb;
int err;
/* Check outgoing MTU */
if (len > conn->mtu)
if (skb->len > conn->mtu)
return -EINVAL;
BT_DBG("sk %p len %d", sk, len);
BT_DBG("sk %p len %d", sk, skb->len);
skb = bt_skb_send_alloc(sk, len, msg_flags & MSG_DONTWAIT, &err);
if (!skb)
return err;
memcpy(skb_put(skb, len), buf, len);
hci_send_sco(conn->hcon, skb);
return len;
return skb->len;
}
static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
@ -715,7 +707,7 @@ static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
size_t len)
{
struct sock *sk = sock->sk;
void *buf;
struct sk_buff *skb;
int err;
BT_DBG("sock %p, sk %p", sock, sk);
@ -727,24 +719,20 @@ static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (memcpy_from_msg(buf, msg, len)) {
kfree(buf);
return -EFAULT;
}
skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0);
if (IS_ERR_OR_NULL(skb))
return PTR_ERR(skb);
lock_sock(sk);
if (sk->sk_state == BT_CONNECTED)
err = sco_send_frame(sk, buf, len, msg->msg_flags);
err = sco_send_frame(sk, skb);
else
err = -ENOTCONN;
release_sock(sk);
kfree(buf);
if (err)
kfree_skb(skb);
return err;
}