static int carl9170_usb_flush(struct ar9170 *ar)
{
struct urb *urb;
int ret, err = 0;
while ((urb = usb_get_from_anchor(&ar->tx_wait))) {
struct sk_buff *skb = (void *)urb->context;
carl9170_tx_drop(ar, skb);
carl9170_tx_callback(ar, skb);
usb_free_urb(urb);
}
ret = usb_wait_anchor_empty_timeout(&ar->tx_cmd, 1000);
if (ret == 0)
err = -ETIMEDOUT;
/* lets wait a while until the tx - queues are dried out */
ret = usb_wait_anchor_empty_timeout(&ar->tx_anch, 1000);
if (ret == 0)
err = -ETIMEDOUT;
usb_kill_anchored_urbs(&ar->tx_anch);
carl9170_usb_handle_tx_err(ar);
return err;
}
void carl9170_usb_handle_tx_err(struct ar9170 *ar)
{
struct urb *urb;
while ((urb = usb_get_from_anchor(&ar->tx_err))) {
struct sk_buff *skb = (void *)urb->context;
carl9170_tx_drop(ar, skb);
carl9170_tx_callback(ar, skb);
usb_free_urb(urb);
}
}
static void carl9170_usb_tx_data_complete(struct urb *urb)
{
struct ar9170 *ar = (struct ar9170 *)
usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
if (WARN_ON_ONCE(!ar)) {
dev_kfree_skb_irq(urb->context);
return;
}
atomic_dec(&ar->tx_anch_urbs);
switch (urb->status) {
/* everything is fine */
case 0:
carl9170_tx_callback(ar, (void *)urb->context);
break;
/* disconnect */
case -ENOENT:
case -ECONNRESET:
case -ENODEV:
case -ESHUTDOWN:
/*
* Defer the frame clean-up to the tasklet worker.
* This is necessary, because carl9170_tx_drop
* does not work in an irqsave context.
*/
usb_anchor_urb(urb, &ar->tx_err);
return;
/* a random transmission error has occurred? */
default:
if (net_ratelimit()) {
dev_err(&ar->udev->dev, "tx failed (%d)\n",
urb->status);
}
usb_anchor_urb(urb, &ar->tx_err);
break;
}
if (likely(IS_STARTED(ar)))
carl9170_usb_submit_data_urb(ar);
}
void carl9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb)
{
struct urb *urb;
struct ar9170_stream *tx_stream;
void *data;
unsigned int len;
if (!IS_STARTED(ar))
goto err_drop;
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
goto err_drop;
if (ar->fw.tx_stream) {
tx_stream = (void *) (skb->data - sizeof(*tx_stream));
len = skb->len + sizeof(*tx_stream);
tx_stream->length = cpu_to_le16(len);
tx_stream->tag = cpu_to_le16(AR9170_TX_STREAM_TAG);
data = tx_stream;
} else {
data = skb->data;
len = skb->len;
}
usb_fill_bulk_urb(urb, ar->udev, usb_sndbulkpipe(ar->udev,
AR9170_USB_EP_TX), data, len,
carl9170_usb_tx_data_complete, skb);
urb->transfer_flags |= URB_ZERO_PACKET;
usb_anchor_urb(urb, &ar->tx_wait);
usb_free_urb(urb);
carl9170_usb_submit_data_urb(ar);
return;
err_drop:
carl9170_tx_drop(ar, skb);
carl9170_tx_callback(ar, skb);
}
