static void usbnet_terminate_urbs(struct usbnet *dev)
{
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
DECLARE_WAITQUEUE(wait, current);
int temp;
/* ensure there are no more active urbs */
add_wait_queue(&unlink_wakeup, &wait);
set_current_state(TASK_UNINTERRUPTIBLE);
dev->wait = &unlink_wakeup;
temp = unlink_urbs(dev, &dev->txq) +
unlink_urbs(dev, &dev->rxq);
/* maybe wait for deletions to finish. */
while (!skb_queue_empty(&dev->rxq)
&& !skb_queue_empty(&dev->txq)
&& !skb_queue_empty(&dev->done)) {
schedule_timeout(UNLINK_TIMEOUT_MS);
set_current_state(TASK_UNINTERRUPTIBLE);
if (netif_msg_ifdown(dev))
devdbg(dev, "waited for %d urb completions",
temp);
}
set_current_state(TASK_RUNNING);
dev->wait = NULL;
remove_wait_queue(&unlink_wakeup, &wait);
}
static void intr_complete(struct urb *urb)
#endif
{
struct usbnet *dev = urb->context;
int status = urb->status;
switch (status) {
/* success */
case 0:
dev->driver_info->status(dev, urb);
break;
/* software-driven interface shutdown */
case -ENOENT: /* urb killed */
case -ESHUTDOWN: /* hardware gone */
if (netif_msg_ifdown(dev))
devdbg(dev, "intr shutdown, code %d", status);
return;
/* NOTE: not throttling like RX/TX, since this endpoint
* already polls infrequently
*/
default:
devdbg(dev, "intr status %d", status);
break;
}
if (!netif_running(dev->net))
return;
memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status != 0 && netif_msg_timer(dev))
deverr(dev, "intr resubmit --> %d", status);
}
static int lpc_eth_close(struct net_device *ndev)
{
unsigned long flags;
struct netdata_local *pldat = netdev_priv(ndev);
if (netif_msg_ifdown(pldat))
dev_dbg(&pldat->pdev->dev, "shutting down %s\n", ndev->name);
napi_disable(&pldat->napi);
netif_stop_queue(ndev);
if (pldat->phy_dev)
phy_stop(pldat->phy_dev);
spin_lock_irqsave(&pldat->lock, flags);
__lpc_eth_reset(pldat);
netif_carrier_off(ndev);
writel(0, LPC_ENET_MAC1(pldat->net_base));
writel(0, LPC_ENET_MAC2(pldat->net_base));
spin_unlock_irqrestore(&pldat->lock, flags);
__lpc_eth_clock_enable(pldat, false);
return 0;
}
int usbnet_stop (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
struct driver_info *info = dev->driver_info;
int retval;
netif_stop_queue (net);
if (netif_msg_ifdown (dev))
devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
net->stats.rx_packets, net->stats.tx_packets,
net->stats.rx_errors, net->stats.tx_errors
);
/* allow minidriver to stop correctly (wireless devices to turn off
* radio etc) */
if (info->stop) {
retval = info->stop(dev);
if (retval < 0 && netif_msg_ifdown(dev))
devinfo(dev,
"stop fail (%d) usbnet usb-%s-%s, %s",
retval,
dev->udev->bus->bus_name, dev->udev->devpath,
info->description);
}
if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
usbnet_terminate_urbs(dev);
usb_kill_urb(dev->interrupt);
usbnet_purge_paused_rxq(dev);
/* deferred work (task, timer, softirq) must also stop.
* can't flush_scheduled_work() until we drop rtnl (later),
* else workers could deadlock; so make workers a NOP.
*/
dev->flags = 0;
del_timer_sync (&dev->delay);
tasklet_kill (&dev->bh);
if (info->manage_power)
info->manage_power(dev, 0);
else
usb_autopm_put_interface(dev->intf);
return 0;
}
static int usbnet_stop (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
int temp;
DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup);
DECLARE_WAITQUEUE (wait, current);
netif_stop_queue (net);
if (netif_msg_ifdown (dev))
devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
dev->stats.rx_packets, dev->stats.tx_packets,
dev->stats.rx_errors, dev->stats.tx_errors
);
// ensure there are no more active urbs
add_wait_queue (&unlink_wakeup, &wait);
dev->wait = &unlink_wakeup;
temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq);
// maybe wait for deletions to finish.
while (!skb_queue_empty(&dev->rxq) &&
!skb_queue_empty(&dev->txq) &&
!skb_queue_empty(&dev->done)) {
msleep(UNLINK_TIMEOUT_MS);
if (netif_msg_ifdown (dev))
devdbg (dev, "waited for %d urb completions", temp);
}
dev->wait = NULL;
remove_wait_queue (&unlink_wakeup, &wait);
usb_kill_urb(dev->interrupt);
/* deferred work (task, timer, softirq) must also stop.
* can't flush_scheduled_work() until we drop rtnl (later),
* else workers could deadlock; so make workers a NOP.
*/
dev->flags = 0;
del_timer_sync (&dev->delay);
tasklet_kill (&dev->bh);
return 0;
}
static INT bcm_close(struct net_device *dev)
{
struct bcm_mini_adapter *Adapter = GET_BCM_ADAPTER(dev);
if (netif_msg_ifdown(Adapter))
pr_info(PFX "%s: disabling interface\n", dev->name);
netif_carrier_off(dev);
netif_stop_queue(dev);
return 0;
}
static int cyrf6936_net_stop(struct net_device *dev)
{
struct cyrf6936_net *p = netdev_priv(dev);
if (netif_msg_ifdown(p))
dev_dbg(&p->netdev->dev, "closing network device\n");
mutex_lock(&p->lock);
netif_stop_queue(dev);
if (p->pollmode)
del_timer_sync(&p->poll_timer);
flush_scheduled_work();
if (p->tx_skb)
dev_kfree_skb(p->tx_skb);
mutex_unlock(&p->lock);
return 0;
}
/* Stop the interface.
* The interface is stopped when it is brought.
*/
static int emac_stop(struct net_device *ndev)
{
struct emac_board_info *db = netdev_priv(ndev);
if (netif_msg_ifdown(db))
dev_dbg(db->dev, "shutting down %s\n", ndev->name);
netif_stop_queue(ndev);
netif_carrier_off(ndev);
phy_stop(ndev->phydev);
emac_mdio_remove(ndev);
emac_shutdown(ndev);
free_irq(ndev->irq, ndev);
return 0;
}
static int c2_down(struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
struct c2_dev *c2dev = c2_port->c2dev;
if (netif_msg_ifdown(c2_port))
pr_debug("%s: disabling interface\n",
netdev->name);
c2_tx_interrupt(netdev);
netif_stop_queue(netdev);
writel(1, c2dev->regs + C2_IDIS);
writel(0, c2dev->regs + C2_NIMR0);
c2_reset(c2_port);
c2_tx_clean(c2_port);
c2_rx_clean(c2_port);
kfree(c2_port->rx_ring.start);
kfree(c2_port->tx_ring.start);
pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
c2_port->dma);
return 0;
}
static int c2_down(struct net_device *netdev)
{
struct c2_port *c2_port = netdev_priv(netdev);
struct c2_dev *c2dev = c2_port->c2dev;
if (netif_msg_ifdown(c2_port))
pr_debug("%s: disabling interface\n",
netdev->name);
/* Wait for all the queued packets to get sent */
c2_tx_interrupt(netdev);
/* Disable network packets */
netif_stop_queue(netdev);
/* Disable IRQs by clearing the interrupt mask */
writel(1, c2dev->regs + C2_IDIS);
writel(0, c2dev->regs + C2_NIMR0);
/* missing: Stop transmitter */
/* missing: Stop receiver */
/* Reset the adapter, ensures the driver is in sync with the RXP */
c2_reset(c2_port);
/* missing: Turn off LEDs here */
/* Free all buffers in the host descriptor rings */
c2_tx_clean(c2_port);
c2_rx_clean(c2_port);
/* Free the host descriptor rings */
kfree(c2_port->rx_ring.start);
kfree(c2_port->tx_ring.start);
pci_free_consistent(c2dev->pcidev, c2_port->mem_size, c2_port->mem,
c2_port->dma);
return 0;
}
static int cp_close (struct net_device *dev)
{
struct cp_private *cp = netdev_priv(dev);
unsigned long flags;
if (netif_msg_ifdown(cp))
printk(KERN_DEBUG "%s: disabling interface\n", dev->name);
spin_lock_irqsave(&cp->lock, flags);
netif_stop_queue(dev);
netif_carrier_off(dev);
cp_stop_hw(cp);
spin_unlock_irqrestore(&cp->lock, flags);
synchronize_irq(dev->irq);
free_irq(dev->irq, dev);
cp_free_rings(cp);
return 0;
}
/*------------------------------------------------------------
函数原型: void intr_completion(struct urb * purb)
描述: intr_completion是read_interrupt_ndis_msg的完成例程，
输入: 提交的urb指针
输出: 有效的命令通告
返回值: 无
-------------------------------------------------------------*/
static void intr_completion(struct urb * purb)
{
int status = 0;
/* <DTS2013011408161 move urb request to ndistty z00185914 20130125 BEGIN */
int urbstatus = purb->status;
struct usb_ctrlrequest * ctlreq;
static int i = 0;
if (-ENOENT == urbstatus || -ESHUTDOWN == urbstatus)
{
if (netif_msg_ifdown (hwcdc_net)){
printk("[%s][%d] intr shutdown, code %d\r\n",__FILE__,__LINE__,urbstatus);
}
return;
}
/* DTS2013011408161 move urb request to ndistty z00185914 20130125 END> */
if (purb->actual_length == 0)
{
if (i++ < 10)
{
printk("%s -- i = %d\n", __FUNCTION__, i);
}
goto readtimer;/* lint !e801 */
}
else
{
ctlreq = (struct usb_ctrlrequest *)purb->transfer_buffer;
//printk("Request = 0x%02x, Request type = 0x%02x\n", ctlreq->bRequest, ctlreq->bRequestType);
if (0xa1 == ctlreq->bRequestType)
{
switch (ctlreq->bRequest)
{
case CDC_NOTIFICATION_SERIAL_STATE:
{
VIEW_TIMER("CDC_NOTIFICATION_SERIAL_STATE");
break;
}
case CDC_NOTIFICATION_NETWORK_CONNECTION:
{
VIEW_TIMER("CDC_NOTIFICATION_NETWORK_CONNECTION");
break;
}
case CDC_NOTIFICATION_CONNECTION_SPD_CHG:
{
VIEW_TIMER("CDC_NOTIFICATION_CONNECTION_SPD_CHG");
break;
}
case CDC_NOTIFICATION_RESPONSE_AVAILABLE:
{
VIEW_TIMER("CDC available message");
if(connect_stat)
{
VIEW_TIMER("CDC_NOTIFICATION_RESPONSE_AVAILABLE: handle_response_available\n");
// handle_response_available();/* DTS2010112205139.NDISTTY: mayang 2010-11-20 Mod */
schedule_work((struct work_struct*)purb->context);
}
break;
}
default:
{
VIEW_TIMER("CDC, default case.");
break;
}
}
}
}
/* re-submit intr urb */
if(connect_stat)
{
memset(purb->transfer_buffer, 0, purb->transfer_buffer_length);
status = usb_submit_urb (purb, GFP_ATOMIC);
/* <DTS2013021703454 优化ndis拨号代码 z00185914 20130217 DELETE 1 ROW */
if (status != 0)
{
printk("%s - resubmit intr urb failed, status=%d\n", __FUNCTION__, status);
}
}
readtimer:
VIEW_TIMER("CDC message end");
}
static
int axusbnet_stop(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
struct driver_info *info = dev->driver_info;
int temp;
int retval;
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
#else
DECLARE_WAIT_QUEUE_HEAD(unlink_wakeup);
#endif
DECLARE_WAITQUEUE(wait, current);
netif_stop_queue(net);
if (netif_msg_ifdown(dev))
devinfo(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
dev->stats.rx_packets, dev->stats.tx_packets,
dev->stats.rx_errors, dev->stats.tx_errors);
/* allow minidriver to stop correctly (wireless devices to turn off
* radio etc) */
if (info->stop) {
retval = info->stop(dev);
if (retval < 0 && netif_msg_ifdown(dev))
devinfo(dev,
"stop fail (%d) usbnet usb-%s-%s, %s",
retval,
dev->udev->bus->bus_name, dev->udev->devpath,
info->description);
}
if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) {
/* ensure there are no more active urbs */
add_wait_queue(&unlink_wakeup, &wait);
dev->wait = &unlink_wakeup;
temp = unlink_urbs(dev, &dev->txq) +
unlink_urbs(dev, &dev->rxq);
/* maybe wait for deletions to finish. */
while (!skb_queue_empty(&dev->rxq)
&& !skb_queue_empty(&dev->txq)
&& !skb_queue_empty(&dev->done)) {
msleep(UNLINK_TIMEOUT_MS);
if (netif_msg_ifdown(dev))
devdbg(dev, "waited for %d urb completions",
temp);
}
dev->wait = NULL;
remove_wait_queue(&unlink_wakeup, &wait);
}
usb_kill_urb(dev->interrupt);
/* deferred work (task, timer, softirq) must also stop.
* can't flush_scheduled_work() until we drop rtnl (later),
* else workers could deadlock; so make workers a NOP.
*/
dev->flags = 0;
del_timer_sync(&dev->delay);
tasklet_kill(&dev->bh);
return 0;
}
static void rx_complete(struct urb *urb)
#endif
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct skb_data *entry = (struct skb_data *) skb->cb;
struct usbnet *dev = entry->dev;
int urb_status = urb->status;
skb_put(skb, urb->actual_length);
entry->state = rx_done;
entry->urb = NULL;
switch (urb_status) {
/* success */
case 0:
if (skb->len < dev->net->hard_header_len) {
entry->state = rx_cleanup;
dev->stats.rx_errors++;
dev->stats.rx_length_errors++;
if (netif_msg_rx_err(dev))
devdbg(dev, "rx length %d", skb->len);
}
break;
/* stalls need manual reset. this is rare ... except that
* when going through USB 2.0 TTs, unplug appears this way.
* we avoid the highspeed version of the ETIMEDOUT/EILSEQ
* storm, recovering as needed.
*/
case -EPIPE:
dev->stats.rx_errors++;
axusbnet_defer_kevent(dev, EVENT_RX_HALT);
/* FALLTHROUGH */
/* software-driven interface shutdown */
case -ECONNRESET: /* async unlink */
case -ESHUTDOWN: /* hardware gone */
if (netif_msg_ifdown(dev))
devdbg(dev, "rx shutdown, code %d", urb_status);
goto block;
/* we get controller i/o faults during khubd disconnect() delays.
* throttle down resubmits, to avoid log floods; just temporarily,
* so we still recover when the fault isn't a khubd delay.
*/
case -EPROTO:
case -ETIME:
case -EILSEQ:
dev->stats.rx_errors++;
if (!timer_pending(&dev->delay)) {
mod_timer(&dev->delay, jiffies + THROTTLE_JIFFIES);
if (netif_msg_link(dev))
devdbg(dev, "rx throttle %d", urb_status);
}
block:
entry->state = rx_cleanup;
entry->urb = urb;
urb = NULL;
break;
/* data overrun ... flush fifo? */
case -EOVERFLOW:
dev->stats.rx_over_errors++;
/* FALLTHROUGH */
default:
entry->state = rx_cleanup;
dev->stats.rx_errors++;
if (netif_msg_rx_err(dev))
devdbg(dev, "rx status %d", urb_status);
break;
}
defer_bh(dev, skb, &dev->rxq);
if (urb) {
if (netif_running(dev->net) &&
!test_bit(EVENT_RX_HALT, &dev->flags)) {
rx_submit(dev, urb, GFP_ATOMIC);
return;
}
usb_free_urb(urb);
}
if (netif_msg_rx_err(dev))
devdbg(dev, "no read resubmitted");
}
static void rx_submit(struct usbnet *dev, struct urb *urb, gfp_t flags)
{
struct sk_buff *skb;
struct skb_data *entry;
int retval = 0;
unsigned long lockflags;
size_t size = dev->rx_urb_size;
struct driver_info *info = dev->driver_info;
u8 align;
#if (AX_FORCE_BUFF_ALIGN)
align = 0;
#else
if (!(info->flags & FLAG_HW_IP_ALIGNMENT))
align = NET_IP_ALIGN;
else
align = 0;
#endif
skb = alloc_skb(size + align, flags);
if (skb == NULL) {
if (netif_msg_rx_err(dev))
devdbg(dev, "no rx skb");
if ((dev->rx_urb_size > 2048) && dev->rx_size) {
dev->rx_size--;
dev->rx_urb_size =
AX88772B_BULKIN_SIZE[dev->rx_size].size;
ax8817x_write_cmd_async(dev, 0x2A,
AX88772B_BULKIN_SIZE[dev->rx_size].byte_cnt,
AX88772B_BULKIN_SIZE[dev->rx_size].threshold,
0, NULL);
}
if (!(dev->flags & EVENT_RX_MEMORY))
axusbnet_defer_kevent(dev, EVENT_RX_MEMORY);
usb_free_urb(urb);
return;
}
if (align)
skb_reserve(skb, NET_IP_ALIGN);
entry = (struct skb_data *) skb->cb;
entry->urb = urb;
entry->dev = dev;
entry->state = rx_start;
entry->length = 0;
usb_fill_bulk_urb(urb, dev->udev, dev->in, skb->data,
size, rx_complete, skb);
spin_lock_irqsave(&dev->rxq.lock, lockflags);
if (netif_running(dev->net)
&& netif_device_present(dev->net)
&& !test_bit(EVENT_RX_HALT, &dev->flags)) {
switch (retval = usb_submit_urb(urb, GFP_ATOMIC)) {
case -EPIPE:
axusbnet_defer_kevent(dev, EVENT_RX_HALT);
break;
case -ENOMEM:
axusbnet_defer_kevent(dev, EVENT_RX_MEMORY);
break;
case -ENODEV:
if (netif_msg_ifdown(dev))
devdbg(dev, "device gone");
netif_device_detach(dev->net);
break;
default:
if (netif_msg_rx_err(dev))
devdbg(dev, "rx submit, %d", retval);
tasklet_schedule(&dev->bh);
break;
case 0:
__skb_queue_tail(&dev->rxq, skb);
}
} else {
if (netif_msg_ifdown(dev))
devdbg(dev, "rx: stopped");
retval = -ENOLINK;
}
spin_unlock_irqrestore(&dev->rxq.lock, lockflags);
if (retval) {
dev_kfree_skb_any(skb);
usb_free_urb(urb);
}
}
static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
{
struct sk_buff *skb;
struct skb_data *entry;
int retval = 0;
unsigned long lockflags;
size_t size = dev->rx_urb_size;
if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
if (netif_msg_rx_err (dev))
devdbg (dev, "no rx skb");
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
usb_free_urb (urb);
return;
}
skb_reserve (skb, NET_IP_ALIGN);
entry = (struct skb_data *) skb->cb;
entry->urb = urb;
entry->dev = dev;
entry->state = rx_start;
entry->length = 0;
usb_fill_bulk_urb (urb, dev->udev, dev->in,
skb->data, size, rx_complete, skb);
spin_lock_irqsave (&dev->rxq.lock, lockflags);
if (netif_running (dev->net)
&& netif_device_present (dev->net)
&& !test_bit (EVENT_RX_HALT, &dev->flags)) {
switch (retval = usb_submit_urb (urb, GFP_ATOMIC)){
case -EPIPE:
usbnet_defer_kevent (dev, EVENT_RX_HALT);
break;
case -ENOMEM:
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
break;
case -ENODEV:
if (netif_msg_ifdown (dev))
devdbg (dev, "device gone");
netif_device_detach (dev->net);
break;
default:
if (netif_msg_rx_err (dev))
devdbg (dev, "rx submit, %d", retval);
tasklet_schedule (&dev->bh);
break;
case 0:
__skb_queue_tail (&dev->rxq, skb);
}
} else {
if (netif_msg_ifdown (dev))
devdbg (dev, "rx: stopped");
retval = -ENOLINK;
}
spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
if (retval) {
dev_kfree_skb_any (skb);
usb_free_urb (urb);
}
}
static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
{
struct sk_buff *skb;
struct skb_data *entry;
int retval = 0;
unsigned long lockflags;
size_t size = dev->rx_urb_size;
#if defined(CONFIG_RA_HW_NAT_PCI) && (defined(CONFIG_RA_HW_NAT) || defined(CONFIG_RA_HW_NAT_MODULE))
if ((skb = alloc_skb (size + NET_IP_ALIGN + FOE_INFO_LEN, flags)) == NULL) {
#else
if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
#endif
if (netif_msg_rx_err (dev))
devdbg (dev, "no rx skb");
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
usb_free_urb (urb);
return;
}
#if defined(CONFIG_RA_HW_NAT_PCI) && (defined(CONFIG_RA_HW_NAT) || defined(CONFIG_RA_HW_NAT_MODULE))
skb_reserve (skb, NET_IP_ALIGN + FOE_INFO_LEN);
#else
skb_reserve (skb, NET_IP_ALIGN);
#endif
entry = (struct skb_data *) skb->cb;
entry->urb = urb;
entry->dev = dev;
entry->length = 0;
usb_fill_bulk_urb (urb, dev->udev, dev->in,
skb->data, size, rx_complete, skb);
spin_lock_irqsave (&dev->rxq.lock, lockflags);
if (netif_running (dev->net)
&& netif_device_present (dev->net)
&& !test_bit (EVENT_RX_HALT, &dev->flags)) {
switch (retval = usb_submit_urb (urb, GFP_ATOMIC)){
case -EPIPE:
usbnet_defer_kevent (dev, EVENT_RX_HALT);
break;
case -ENOMEM:
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
break;
case -ENODEV:
if (netif_msg_ifdown (dev))
devdbg (dev, "device gone");
netif_device_detach (dev->net);
break;
default:
if (netif_msg_rx_err (dev))
devdbg (dev, "rx submit, %d", retval);
tasklet_schedule (&dev->bh);
break;
case 0:
__usbnet_queue_skb(&dev->rxq, skb, rx_start);
}
} else {
if (netif_msg_ifdown (dev))
devdbg (dev, "rx: stopped");
retval = -ENOLINK;
}
spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
if (retval) {
dev_kfree_skb_any (skb);
usb_free_urb (urb);
}
}
/*-------------------------------------------------------------------------*/
static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
{
if (dev->driver_info->rx_fixup
&& !dev->driver_info->rx_fixup (dev, skb))
goto error;
// else network stack removes extra byte if we forced a short packet
if (skb->len)
usbnet_skb_return (dev, skb);
else {
if (netif_msg_rx_err (dev))
devdbg (dev, "drop");
error:
dev->stats.rx_errors++;
skb_queue_tail (&dev->done, skb);
}
}
/*-------------------------------------------------------------------------*/
static void rx_complete (struct urb *urb)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct skb_data *entry = (struct skb_data *) skb->cb;
struct usbnet *dev = entry->dev;
int urb_status = urb->status;
enum skb_state state;
skb_put (skb, urb->actual_length);
state = rx_done;
entry->urb = NULL;
switch (urb_status) {
// success
case 0:
if (skb->len < dev->net->hard_header_len) {
state = rx_cleanup;
dev->stats.rx_errors++;
dev->stats.rx_length_errors++;
if (netif_msg_rx_err (dev))
devdbg (dev, "rx length %d", skb->len);
}
break;
// stalls need manual reset. this is rare ... except that
// when going through USB 2.0 TTs, unplug appears this way.
// we avoid the highspeed version of the ETIMEOUT/EILSEQ
// storm, recovering as needed.
case -EPIPE:
dev->stats.rx_errors++;
usbnet_defer_kevent (dev, EVENT_RX_HALT);
// FALLTHROUGH
// software-driven interface shutdown
case -ECONNRESET: // async unlink
case -ESHUTDOWN: // hardware gone
if (netif_msg_ifdown (dev))
devdbg (dev, "rx shutdown, code %d", urb_status);
goto block;
// we get controller i/o faults during khubd disconnect() delays.
// throttle down resubmits, to avoid log floods; just temporarily,
// so we still recover when the fault isn't a khubd delay.
case -EPROTO:
case -ETIME:
case -EILSEQ:
dev->stats.rx_errors++;
if (!timer_pending (&dev->delay)) {
mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
if (netif_msg_link (dev))
devdbg (dev, "rx throttle %d", urb_status);
}
block:
state = rx_cleanup;
entry->urb = urb;
urb = NULL;
break;
// data overrun ... flush fifo?
case -EOVERFLOW:
dev->stats.rx_over_errors++;
// FALLTHROUGH
default:
state = rx_cleanup;
dev->stats.rx_errors++;
if (netif_msg_rx_err (dev))
devdbg (dev, "rx status %d", urb_status);
break;
}
state = defer_bh(dev, skb, &dev->rxq, state);
if (urb) {
if (netif_running (dev->net)
&& !test_bit (EVENT_RX_HALT, &dev->flags) &&
state != unlink_start) {
rx_submit (dev, urb, GFP_ATOMIC);
return;
}
usb_free_urb (urb);
}
if (netif_msg_rx_err (dev))
devdbg (dev, "no read resubmitted");
}
static void intr_complete (struct urb *urb)
{
struct usbnet *dev = urb->context;
int status = urb->status;
switch (status) {
/* success */
case 0:
dev->driver_info->status(dev, urb);
break;
/* software-driven interface shutdown */
case -ENOENT: // urb killed
case -ESHUTDOWN: // hardware gone
if (netif_msg_ifdown (dev))
devdbg (dev, "intr shutdown, code %d", status);
return;
/* NOTE: not throttling like RX/TX, since this endpoint
* already polls infrequently
*/
default:
devdbg (dev, "intr status %d", status);
break;
}
memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
status = usb_submit_urb (urb, GFP_ATOMIC);
if (status != 0 && netif_msg_timer (dev))
deverr(dev, "intr resubmit --> %d", status);
}
/*-------------------------------------------------------------------------*/
// unlink pending rx/tx; completion handlers do all other cleanup
static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
{
unsigned long flags;
struct sk_buff *skb;
int count = 0;
spin_lock_irqsave (&q->lock, flags);
while (!skb_queue_empty(q)) {
struct skb_data *entry;
struct urb *urb;
int retval;
skb_queue_walk(q, skb) {
entry = (struct skb_data *) skb->cb;
if (entry->state != unlink_start)
goto found;
}
break;
found:
entry->state = unlink_start;
urb = entry->urb;
/*
* Get reference count of the URB to avoid it to be
* freed during usb_unlink_urb, which may trigger
* use-after-free problem inside usb_unlink_urb since
* usb_unlink_urb is always racing with .complete
* handler(include defer_bh).
*/
usb_get_urb(urb);
spin_unlock_irqrestore(&q->lock, flags);
// during some PM-driven resume scenarios,
// these (async) unlinks complete immediately
retval = usb_unlink_urb (urb);
if (retval != -EINPROGRESS && retval != 0)
devdbg (dev, "unlink urb err, %d", retval);
else
count++;
usb_put_urb(urb);
spin_lock_irqsave(&q->lock, flags);
}
