Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 1668 insertions, 0 deletions

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
new file mode 100644
index 00000000..20838aba
--- /dev/null
+++ b/drivers/net/usb/usbnet.c
@@ -0,0 +1,1668 @@
+/*
+ * USB Network driver infrastructure
+ * Copyright (C) 2000-2005 by David Brownell
+ * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * This is a generic "USB networking" framework that works with several
+ * kinds of full and high speed networking devices:  host-to-host cables,
+ * smart usb peripherals, and actual Ethernet adapters.
+ *
+ * These devices usually differ in terms of control protocols (if they
+ * even have one!) and sometimes they define new framing to wrap or batch
+ * Ethernet packets.  Otherwise, they talk to USB pretty much the same,
+ * so interface (un)binding, endpoint I/O queues, fault handling, and other
+ * issues can usefully be addressed by this framework.
+ */
+
+// #define	DEBUG			// error path messages, extra info
+// #define	VERBOSE			// more; success messages
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ctype.h>
+#include <linux/ethtool.h>
+#include <linux/workqueue.h>
+#include <linux/mii.h>
+#include <linux/usb.h>
+#include <linux/usb/usbnet.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/pm_runtime.h>
+
+#define DRIVER_VERSION		"22-Aug-2005"
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
+ * Several dozen bytes of IPv4 data can fit in two such transactions.
+ * One maximum size Ethernet packet takes twenty four of them.
+ * For high speed, each frame comfortably fits almost 36 max size
+ * Ethernet packets (so queues should be bigger).
+ *
+ * REVISIT qlens should be members of 'struct usbnet'; the goal is to
+ * let the USB host controller be busy for 5msec or more before an irq
+ * is required, under load.  Jumbograms change the equation.
+ */
+#define RX_MAX_QUEUE_MEMORY (60 * 1518)
+#define	RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
+			(RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
+#define	TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
+			(RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
+
+// reawaken network queue this soon after stopping; else watchdog barks
+#define TX_TIMEOUT_JIFFIES	(5*HZ)
+
+// throttle rx/tx briefly after some faults, so khubd might disconnect()
+// us (it polls at HZ/4 usually) before we report too many false errors.
+#define THROTTLE_JIFFIES	(HZ/8)
+
+// between wakeups
+#define UNLINK_TIMEOUT_MS	3
+
+/*-------------------------------------------------------------------------*/
+
+// randomly generated ethernet address
+static u8	node_id [ETH_ALEN];
+
+static const char driver_name [] = "usbnet";
+
+/* use ethtool to change the level for any given device */
+static int msg_level = -1;
+module_param (msg_level, int, 0);
+MODULE_PARM_DESC (msg_level, "Override default message level");
+
+/*-------------------------------------------------------------------------*/
+
+
+//add by kevin 
+extern int wmt_getsyspara(const char *varname, char *varval, int * varlen);
+static unsigned char char2hex(char c){
+	unsigned char ret=0xff;
+	if(c>='0'&&c<='9')
+		ret= c-'0';
+	if(c>='a'&&c<='f')
+		ret=  c-'a'+10;
+	if(c>='A'&&c<='F')
+		ret=  c-'A'+10;
+	return ret;
+}
+
+void check_set_mac(unsigned char *buf){
+
+	char ethbuf[50];
+	int  len = sizeof(ethbuf);
+	memset((void*)ethbuf, 0, len);	
+    
+	//wondermedia set bt mac addr
+	if(!wmt_getsyspara("ethaddr", ethbuf, &len)){
+
+       	printk("wmt eth addr %s %d\n",ethbuf,strlen(ethbuf));
+        //ethaddr=00:40:63:70:13:37
+		if(strlen(ethbuf)==17){
+			buf[0] = (char2hex(ethbuf[0])<<4)|char2hex(ethbuf[1]);
+			buf[1] = (char2hex(ethbuf[3])<<4)|char2hex(ethbuf[4]);
+			buf[2] = (char2hex(ethbuf[6])<<4)|char2hex(ethbuf[7]);
+			buf[3] = (char2hex(ethbuf[9])<<4)|char2hex(ethbuf[10]);
+			buf[4] = (char2hex(ethbuf[12])<<4)|char2hex(ethbuf[13]);
+			buf[5] = (char2hex(ethbuf[15])<<4)|char2hex(ethbuf[16]);
+			
+		}
+        //ethaddr=004063701337
+        if(strlen(ethbuf)==12){
+			buf[0] = (char2hex(ethbuf[0])<<4)|char2hex(ethbuf[1]);
+			buf[1] = (char2hex(ethbuf[2])<<4)|char2hex(ethbuf[3]);
+			buf[2] = (char2hex(ethbuf[4])<<4)|char2hex(ethbuf[5]);
+			buf[3] = (char2hex(ethbuf[6])<<4)|char2hex(ethbuf[7]);
+			buf[4] = (char2hex(ethbuf[8])<<4)|char2hex(ethbuf[9]);
+			buf[5] = (char2hex(ethbuf[10])<<4)|char2hex(ethbuf[11]);
+		}		
+	}
+}
+
+
+/* handles CDC Ethernet and many other network "bulk data" interfaces */
+int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
+{
+	int				tmp;
+	struct usb_host_interface	*alt = NULL;
+	struct usb_host_endpoint	*in = NULL, *out = NULL;
+	struct usb_host_endpoint	*status = NULL;
+
+	for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
+		unsigned	ep;
+
+		in = out = status = NULL;
+		alt = intf->altsetting + tmp;
+
+		/* take the first altsetting with in-bulk + out-bulk;
+		 * remember any status endpoint, just in case;
+		 * ignore other endpoints and altsettings.
+		 */
+		for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
+			struct usb_host_endpoint	*e;
+			int				intr = 0;
+
+			e = alt->endpoint + ep;
+			switch (e->desc.bmAttributes) {
+			case USB_ENDPOINT_XFER_INT:
+				if (!usb_endpoint_dir_in(&e->desc))
+					continue;
+				intr = 1;
+				/* FALLTHROUGH */
+			case USB_ENDPOINT_XFER_BULK:
+				break;
+			default:
+				continue;
+			}
+			if (usb_endpoint_dir_in(&e->desc)) {
+				if (!intr && !in)
+					in = e;
+				else if (intr && !status)
+					status = e;
+			} else {
+				if (!out)
+					out = e;
+			}
+		}
+		if (in && out)
+			break;
+	}
+	if (!alt || !in || !out)
+		return -EINVAL;
+
+	if (alt->desc.bAlternateSetting != 0 ||
+	    !(dev->driver_info->flags & FLAG_NO_SETINT)) {
+		tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
+				alt->desc.bAlternateSetting);
+		if (tmp < 0)
+			return tmp;
+	}
+
+	dev->in = usb_rcvbulkpipe (dev->udev,
+			in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
+	dev->out = usb_sndbulkpipe (dev->udev,
+			out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
+	dev->status = status;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
+
+int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
+{
+	int 		tmp, i;
+	unsigned char	buf [13];
+
+	tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
+	if (tmp != 12) {
+		dev_dbg(&dev->udev->dev,
+			"bad MAC string %d fetch, %d\n", iMACAddress, tmp);
+		if (tmp >= 0)
+			tmp = -EINVAL;
+		return tmp;
+	}
+	for (i = tmp = 0; i < 6; i++, tmp += 2)
+		dev->net->dev_addr [i] =
+			(hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
+
+static void intr_complete (struct urb *urb);
+
+static int init_status (struct usbnet *dev, struct usb_interface *intf)
+{
+	char		*buf = NULL;
+	unsigned	pipe = 0;
+	unsigned	maxp;
+	unsigned	period;
+
+	if (!dev->driver_info->status)
+		return 0;
+
+	pipe = usb_rcvintpipe (dev->udev,
+			dev->status->desc.bEndpointAddress
+				& USB_ENDPOINT_NUMBER_MASK);
+	maxp = usb_maxpacket (dev->udev, pipe, 0);
+
+	/* avoid 1 msec chatter:  min 8 msec poll rate */
+	period = max ((int) dev->status->desc.bInterval,
+		(dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
+
+	buf = kmalloc (maxp, GFP_KERNEL);
+	if (buf) {
+		dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
+		if (!dev->interrupt) {
+			kfree (buf);
+			return -ENOMEM;
+		} else {
+			usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
+				buf, maxp, intr_complete, dev, period);
+			dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
+			dev_dbg(&intf->dev,
+				"status ep%din, %d bytes period %d\n",
+				usb_pipeendpoint(pipe), maxp, period);
+		}
+	}
+	return 0;
+}
+
+/* Passes this packet up the stack, updating its accounting.
+ * Some link protocols batch packets, so their rx_fixup paths
+ * can return clones as well as just modify the original skb.
+ */
+void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
+{
+	int	status;
+
+	if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
+		skb_queue_tail(&dev->rxq_pause, skb);
+		return;
+	}
+
+	skb->protocol = eth_type_trans (skb, dev->net);
+	dev->net->stats.rx_packets++;
+	dev->net->stats.rx_bytes += skb->len;
+
+	netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
+		  skb->len + sizeof (struct ethhdr), skb->protocol);
+	memset (skb->cb, 0, sizeof (struct skb_data));
+
+	if (skb_defer_rx_timestamp(skb))
+		return;
+
+	status = netif_rx (skb);
+	if (status != NET_RX_SUCCESS)
+		netif_dbg(dev, rx_err, dev->net,
+			  "netif_rx status %d\n", status);
+}
+EXPORT_SYMBOL_GPL(usbnet_skb_return);
+
+
+/*-------------------------------------------------------------------------
+ *
+ * Network Device Driver (peer link to "Host Device", from USB host)
+ *
+ *-------------------------------------------------------------------------*/
+
+int usbnet_change_mtu (struct net_device *net, int new_mtu)
+{
+	struct usbnet	*dev = netdev_priv(net);
+	int		ll_mtu = new_mtu + net->hard_header_len;
+	int		old_hard_mtu = dev->hard_mtu;
+	int		old_rx_urb_size = dev->rx_urb_size;
+
+	if (new_mtu <= 0)
+		return -EINVAL;
+	// no second zero-length packet read wanted after mtu-sized packets
+	if ((ll_mtu % dev->maxpacket) == 0)
+		return -EDOM;
+	net->mtu = new_mtu;
+
+	dev->hard_mtu = net->mtu + net->hard_header_len;
+	if (dev->rx_urb_size == old_hard_mtu) {
+		dev->rx_urb_size = dev->hard_mtu;
+		if (dev->rx_urb_size > old_rx_urb_size)
+			usbnet_unlink_rx_urbs(dev);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbnet_change_mtu);
+
+/* The caller must hold list->lock */
+static void __usbnet_queue_skb(struct sk_buff_head *list,
+			struct sk_buff *newsk, enum skb_state state)
+{
+	struct skb_data *entry = (struct skb_data *) newsk->cb;
+
+	__skb_queue_tail(list, newsk);
+	entry->state = state;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
+ * completion callbacks.  2.5 should have fixed those bugs...
+ */
+
+static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
+		struct sk_buff_head *list, enum skb_state state)
+{
+	unsigned long		flags;
+	enum skb_state 		old_state;
+	struct skb_data *entry = (struct skb_data *) skb->cb;
+
+	spin_lock_irqsave(&list->lock, flags);
+	old_state = entry->state;
+	entry->state = state;
+	__skb_unlink(skb, list);
+	spin_unlock(&list->lock);
+	spin_lock(&dev->done.lock);
+	__skb_queue_tail(&dev->done, skb);
+	if (dev->done.qlen == 1)
+		tasklet_schedule(&dev->bh);
+	spin_unlock_irqrestore(&dev->done.lock, flags);
+	return old_state;
+}
+
+/* some work can't be done in tasklets, so we use keventd
+ *
+ * NOTE:  annoying asymmetry:  if it's active, schedule_work() fails,
+ * but tasklet_schedule() doesn't.  hope the failure is rare.
+ */
+void usbnet_defer_kevent (struct usbnet *dev, int work)
+{
+	set_bit (work, &dev->flags);
+	if (!schedule_work (&dev->kevent))
+		netdev_err(dev->net, "kevent %d may have been dropped\n", work);
+	else
+		netdev_dbg(dev->net, "kevent %d scheduled\n", work);
+}
+EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
+
+/*-------------------------------------------------------------------------*/
+
+static void rx_complete (struct urb *urb);
+
+static int 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;
+
+	skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
+	if (!skb) {
+		netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
+		usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
+		usb_free_urb (urb);
+		return -ENOMEM;
+	}
+
+	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) &&
+	    !test_bit (EVENT_DEV_ASLEEP, &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:
+			netif_dbg(dev, ifdown, dev->net, "device gone\n");
+			netif_device_detach (dev->net);
+			break;
+		case -EHOSTUNREACH:
+			retval = -ENOLINK;
+			break;
+		default:
+			netif_dbg(dev, rx_err, dev->net,
+				  "rx submit, %d\n", retval);
+			tasklet_schedule (&dev->bh);
+			break;
+		case 0:
+			__usbnet_queue_skb(&dev->rxq, skb, rx_start);
+		}
+	} else {
+		netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
+		retval = -ENOLINK;
+	}
+	spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
+	if (retval) {
+		dev_kfree_skb_any (skb);
+		usb_free_urb (urb);
+	}
+	return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+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)) {
+		/* With RX_ASSEMBLE, rx_fixup() must update counters */
+		if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
+			dev->net->stats.rx_errors++;
+		goto done;
+	}
+	// else network stack removes extra byte if we forced a short packet
+
+	if (skb->len) {
+		/* all data was already cloned from skb inside the driver */
+		if (dev->driver_info->flags & FLAG_MULTI_PACKET)
+			dev_kfree_skb_any(skb);
+		else
+			usbnet_skb_return(dev, skb);
+		return;
+	}
+
+	netif_dbg(dev, rx_err, dev->net, "drop\n");
+	dev->net->stats.rx_errors++;
+done:
+	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->net->stats.rx_errors++;
+			dev->net->stats.rx_length_errors++;
+			netif_dbg(dev, rx_err, dev->net,
+				  "rx length %d\n", 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->net->stats.rx_errors++;
+		usbnet_defer_kevent (dev, EVENT_RX_HALT);
+		// FALLTHROUGH
+
+	/* software-driven interface shutdown */
+	case -ECONNRESET:		/* async unlink */
+	case -ESHUTDOWN:		/* hardware gone */
+		netif_dbg(dev, ifdown, dev->net,
+			  "rx shutdown, code %d\n", 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->net->stats.rx_errors++;
+		if (!timer_pending (&dev->delay)) {
+			mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
+			netif_dbg(dev, link, dev->net,
+				  "rx throttle %d\n", urb_status);
+		}
+block:
+		state = rx_cleanup;
+		entry->urb = urb;
+		urb = NULL;
+		break;
+
+	/* data overrun ... flush fifo? */
+	case -EOVERFLOW:
+		dev->net->stats.rx_over_errors++;
+		// FALLTHROUGH
+
+	default:
+		state = rx_cleanup;
+		dev->net->stats.rx_errors++;
+		netif_dbg(dev, rx_err, dev->net, "rx status %d\n", 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);
+			usb_mark_last_busy(dev->udev);
+			return;
+		}
+		usb_free_urb (urb);
+	}
+	netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
+}
+
+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 */
+		netif_dbg(dev, ifdown, dev->net,
+			  "intr shutdown, code %d\n", status);
+		return;
+
+	/* NOTE:  not throttling like RX/TX, since this endpoint
+	 * already polls infrequently
+	 */
+	default:
+		netdev_dbg(dev->net, "intr status %d\n", 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_err(dev, timer, dev->net,
+			  "intr resubmit --> %d\n", status);
+}
+
+/*-------------------------------------------------------------------------*/
+void usbnet_pause_rx(struct usbnet *dev)
+{
+	set_bit(EVENT_RX_PAUSED, &dev->flags);
+
+	netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
+}
+EXPORT_SYMBOL_GPL(usbnet_pause_rx);
+
+void usbnet_resume_rx(struct usbnet *dev)
+{
+	struct sk_buff *skb;
+	int num = 0;
+
+	clear_bit(EVENT_RX_PAUSED, &dev->flags);
+
+	while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
+		usbnet_skb_return(dev, skb);
+		num++;
+	}
+
+	tasklet_schedule(&dev->bh);
+
+	netif_dbg(dev, rx_status, dev->net,
+		  "paused rx queue disabled, %d skbs requeued\n", num);
+}
+EXPORT_SYMBOL_GPL(usbnet_resume_rx);
+
+void usbnet_purge_paused_rxq(struct usbnet *dev)
+{
+	skb_queue_purge(&dev->rxq_pause);
+}
+EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
+
+/*-------------------------------------------------------------------------*/
+
+// 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)
+			netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
+		else
+			count++;
+		usb_put_urb(urb);
+		spin_lock_irqsave(&q->lock, flags);
+	}
+	spin_unlock_irqrestore (&q->lock, flags);
+	return count;
+}
+
+// Flush all pending rx urbs
+// minidrivers may need to do this when the MTU changes
+
+void usbnet_unlink_rx_urbs(struct usbnet *dev)
+{
+	if (netif_running(dev->net)) {
+		(void) unlink_urbs (dev, &dev->rxq);
+		tasklet_schedule(&dev->bh);
+	}
+}
+EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
+
+/*-------------------------------------------------------------------------*/
+
+// precondition: never called in_interrupt
+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(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			netif_dbg(dev, ifdown, dev->net,
+				  "waited for %d urb completions\n", temp);
+	}
+	set_current_state(TASK_RUNNING);
+	dev->wait = NULL;
+	remove_wait_queue(&unlink_wakeup, &wait);
+}
+
+int usbnet_stop (struct net_device *net)
+{
+	struct usbnet		*dev = netdev_priv(net);
+	struct driver_info	*info = dev->driver_info;
+	int			retval;
+
+	clear_bit(EVENT_DEV_OPEN, &dev->flags);
+	netif_stop_queue (net);
+
+	netif_info(dev, ifdown, dev->net,
+		   "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
+		   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_info(dev, ifdown, dev->net,
+				   "stop fail (%d) usbnet usb-%s-%s, %s\n",
+				   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;
+}
+EXPORT_SYMBOL_GPL(usbnet_stop);
+
+/*-------------------------------------------------------------------------*/
+
+// posts reads, and enables write queuing
+
+// precondition: never called in_interrupt
+
+int usbnet_open (struct net_device *net)
+{
+	struct usbnet		*dev = netdev_priv(net);
+	int			retval;
+	struct driver_info	*info = dev->driver_info;
+
+	if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
+		netif_info(dev, ifup, dev->net,
+			   "resumption fail (%d) usbnet usb-%s-%s, %s\n",
+			   retval,
+			   dev->udev->bus->bus_name,
+			   dev->udev->devpath,
+			   info->description);
+		goto done_nopm;
+	}
+
+	// put into "known safe" state
+	if (info->reset && (retval = info->reset (dev)) < 0) {
+		netif_info(dev, ifup, dev->net,
+			   "open reset fail (%d) usbnet usb-%s-%s, %s\n",
+			   retval,
+			   dev->udev->bus->bus_name,
+			   dev->udev->devpath,
+			   info->description);
+		goto done;
+	}
+
+	// insist peer be connected
+	if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
+		netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
+		goto done;
+	}
+
+	/* start any status interrupt transfer */
+	if (dev->interrupt) {
+		retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
+		if (retval < 0) {
+			netif_err(dev, ifup, dev->net,
+				  "intr submit %d\n", retval);
+			goto done;
+		}
+	}
+
+	set_bit(EVENT_DEV_OPEN, &dev->flags);
+	netif_start_queue (net);
+	netif_info(dev, ifup, dev->net,
+		   "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
+		   (int)RX_QLEN(dev), (int)TX_QLEN(dev),
+		   dev->net->mtu,
+		   (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
+		   (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
+		   (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
+		   (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
+		   (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
+		   "simple");
+
+	// delay posting reads until we're fully open
+	tasklet_schedule (&dev->bh);
+	if (info->manage_power) {
+		retval = info->manage_power(dev, 1);
+		if (retval < 0)
+			goto done;
+		usb_autopm_put_interface(dev->intf);
+	}
+	return retval;
+
+done:
+	usb_autopm_put_interface(dev->intf);
+done_nopm:
+	return retval;
+}
+EXPORT_SYMBOL_GPL(usbnet_open);
+
+/*-------------------------------------------------------------------------*/
+
+/* ethtool methods; minidrivers may need to add some more, but
+ * they'll probably want to use this base set.
+ */
+
+int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	if (!dev->mii.mdio_read)
+		return -EOPNOTSUPP;
+
+	return mii_ethtool_gset(&dev->mii, cmd);
+}
+EXPORT_SYMBOL_GPL(usbnet_get_settings);
+
+int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
+{
+	struct usbnet *dev = netdev_priv(net);
+	int retval;
+
+	if (!dev->mii.mdio_write)
+		return -EOPNOTSUPP;
+
+	retval = mii_ethtool_sset(&dev->mii, cmd);
+
+	/* link speed/duplex might have changed */
+	if (dev->driver_info->link_reset)
+		dev->driver_info->link_reset(dev);
+
+	return retval;
+
+}
+EXPORT_SYMBOL_GPL(usbnet_set_settings);
+
+u32 usbnet_get_link (struct net_device *net)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	/* If a check_connect is defined, return its result */
+	if (dev->driver_info->check_connect)
+		return dev->driver_info->check_connect (dev) == 0;
+
+	/* if the device has mii operations, use those */
+	if (dev->mii.mdio_read)
+		return mii_link_ok(&dev->mii);
+
+	/* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
+	return ethtool_op_get_link(net);
+}
+EXPORT_SYMBOL_GPL(usbnet_get_link);
+
+int usbnet_nway_reset(struct net_device *net)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	if (!dev->mii.mdio_write)
+		return -EOPNOTSUPP;
+
+	return mii_nway_restart(&dev->mii);
+}
+EXPORT_SYMBOL_GPL(usbnet_nway_reset);
+
+void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	strncpy (info->driver, dev->driver_name, sizeof info->driver);
+	strncpy (info->version, DRIVER_VERSION, sizeof info->version);
+	strncpy (info->fw_version, dev->driver_info->description,
+		sizeof info->fw_version);
+	usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
+}
+EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
+
+u32 usbnet_get_msglevel (struct net_device *net)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	return dev->msg_enable;
+}
+EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
+
+void usbnet_set_msglevel (struct net_device *net, u32 level)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	dev->msg_enable = level;
+}
+EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
+
+/* drivers may override default ethtool_ops in their bind() routine */
+static const struct ethtool_ops usbnet_ethtool_ops = {
+	.get_settings		= usbnet_get_settings,
+	.set_settings		= usbnet_set_settings,
+	.get_link		= usbnet_get_link,
+	.nway_reset		= usbnet_nway_reset,
+	.get_drvinfo		= usbnet_get_drvinfo,
+	.get_msglevel		= usbnet_get_msglevel,
+	.set_msglevel		= usbnet_set_msglevel,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* work that cannot be done in interrupt context uses keventd.
+ *
+ * NOTE:  with 2.5 we could do more of this using completion callbacks,
+ * especially now that control transfers can be queued.
+ */
+static void
+kevent (struct work_struct *work)
+{
+	struct usbnet		*dev =
+		container_of(work, struct usbnet, kevent);
+	int			status;
+
+	/* usb_clear_halt() needs a thread context */
+	if (test_bit (EVENT_TX_HALT, &dev->flags)) {
+		unlink_urbs (dev, &dev->txq);
+		status = usb_autopm_get_interface(dev->intf);
+		if (status < 0)
+			goto fail_pipe;
+		status = usb_clear_halt (dev->udev, dev->out);
+		usb_autopm_put_interface(dev->intf);
+		if (status < 0 &&
+		    status != -EPIPE &&
+		    status != -ESHUTDOWN) {
+			if (netif_msg_tx_err (dev))
+fail_pipe:
+				netdev_err(dev->net, "can't clear tx halt, status %d\n",
+					   status);
+		} else {
+			clear_bit (EVENT_TX_HALT, &dev->flags);
+			if (status != -ESHUTDOWN)
+				netif_wake_queue (dev->net);
+		}
+	}
+	if (test_bit (EVENT_RX_HALT, &dev->flags)) {
+		unlink_urbs (dev, &dev->rxq);
+		status = usb_autopm_get_interface(dev->intf);
+		if (status < 0)
+			goto fail_halt;
+		status = usb_clear_halt (dev->udev, dev->in);
+		usb_autopm_put_interface(dev->intf);
+		if (status < 0 &&
+		    status != -EPIPE &&
+		    status != -ESHUTDOWN) {
+			if (netif_msg_rx_err (dev))
+fail_halt:
+				netdev_err(dev->net, "can't clear rx halt, status %d\n",
+					   status);
+		} else {
+			clear_bit (EVENT_RX_HALT, &dev->flags);
+			tasklet_schedule (&dev->bh);
+		}
+	}
+
+	/* tasklet could resubmit itself forever if memory is tight */
+	if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
+		struct urb	*urb = NULL;
+		int resched = 1;
+
+		if (netif_running (dev->net))
+			urb = usb_alloc_urb (0, GFP_KERNEL);
+		else
+			clear_bit (EVENT_RX_MEMORY, &dev->flags);
+		if (urb != NULL) {
+			clear_bit (EVENT_RX_MEMORY, &dev->flags);
+			status = usb_autopm_get_interface(dev->intf);
+			if (status < 0) {
+				usb_free_urb(urb);
+				goto fail_lowmem;
+			}
+			if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
+				resched = 0;
+			usb_autopm_put_interface(dev->intf);
+fail_lowmem:
+			if (resched)
+				tasklet_schedule (&dev->bh);
+		}
+	}
+
+	if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
+		struct driver_info	*info = dev->driver_info;
+		int			retval = 0;
+
+		clear_bit (EVENT_LINK_RESET, &dev->flags);
+		status = usb_autopm_get_interface(dev->intf);
+		if (status < 0)
+			goto skip_reset;
+		if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
+			usb_autopm_put_interface(dev->intf);
+skip_reset:
+			netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
+				    retval,
+				    dev->udev->bus->bus_name,
+				    dev->udev->devpath,
+				    info->description);
+		} else {
+			usb_autopm_put_interface(dev->intf);
+		}
+	}
+
+	if (dev->flags)
+		netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void tx_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;
+
+	if (urb->status == 0) {
+		if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
+			dev->net->stats.tx_packets++;
+		dev->net->stats.tx_bytes += entry->length;
+	} else {
+		dev->net->stats.tx_errors++;
+
+		switch (urb->status) {
+		case -EPIPE:
+			usbnet_defer_kevent (dev, EVENT_TX_HALT);
+			break;
+
+		/* software-driven interface shutdown */
+		case -ECONNRESET:		// async unlink
+		case -ESHUTDOWN:		// hardware gone
+			break;
+
+		// like rx, tx gets controller i/o faults during khubd delays
+		// and so it uses the same throttling mechanism.
+		case -EPROTO:
+		case -ETIME:
+		case -EILSEQ:
+			usb_mark_last_busy(dev->udev);
+			if (!timer_pending (&dev->delay)) {
+				mod_timer (&dev->delay,
+					jiffies + THROTTLE_JIFFIES);
+				netif_dbg(dev, link, dev->net,
+					  "tx throttle %d\n", urb->status);
+			}
+			netif_stop_queue (dev->net);
+			break;
+		default:
+			netif_dbg(dev, tx_err, dev->net,
+				  "tx err %d\n", entry->urb->status);
+			break;
+		}
+	}
+
+	usb_autopm_put_interface_async(dev->intf);
+	(void) defer_bh(dev, skb, &dev->txq, tx_done);
+}
+
+/*-------------------------------------------------------------------------*/
+
+void usbnet_tx_timeout (struct net_device *net)
+{
+	struct usbnet		*dev = netdev_priv(net);
+
+	unlink_urbs (dev, &dev->txq);
+	tasklet_schedule (&dev->bh);
+
+	// FIXME: device recovery -- reset?
+}
+EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
+
+/*-------------------------------------------------------------------------*/
+
+netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
+				     struct net_device *net)
+{
+	struct usbnet		*dev = netdev_priv(net);
+	int			length;
+	struct urb		*urb = NULL;
+	struct skb_data		*entry;
+	struct driver_info	*info = dev->driver_info;
+	unsigned long		flags;
+	int retval;
+
+	if (skb)
+		skb_tx_timestamp(skb);
+
+	// some devices want funky USB-level framing, for
+	// win32 driver (usually) and/or hardware quirks
+	if (info->tx_fixup) {
+		skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
+		if (!skb) {
+			if (netif_msg_tx_err(dev)) {
+				netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
+				goto drop;
+			} else {
+				/* cdc_ncm collected packet; waits for more */
+				goto not_drop;
+			}
+		}
+	}
+	length = skb->len;
+
+	if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
+		netif_dbg(dev, tx_err, dev->net, "no urb\n");
+		goto drop;
+	}
+
+	entry = (struct skb_data *) skb->cb;
+	entry->urb = urb;
+	entry->dev = dev;
+	entry->length = length;
+
+	usb_fill_bulk_urb (urb, dev->udev, dev->out,
+			skb->data, skb->len, tx_complete, skb);
+
+	/* don't assume the hardware handles USB_ZERO_PACKET
+	 * NOTE:  strictly conforming cdc-ether devices should expect
+	 * the ZLP here, but ignore the one-byte packet.
+	 * NOTE2: CDC NCM specification is different from CDC ECM when
+	 * handling ZLP/short packets, so cdc_ncm driver will make short
+	 * packet itself if needed.
+	 */
+	if (length % dev->maxpacket == 0) {
+		if (!(info->flags & FLAG_SEND_ZLP)) {
+			if (!(info->flags & FLAG_MULTI_PACKET)) {
+				urb->transfer_buffer_length++;
+				if (skb_tailroom(skb)) {
+					skb->data[skb->len] = 0;
+					__skb_put(skb, 1);
+				}
+			}
+		} else
+			urb->transfer_flags |= URB_ZERO_PACKET;
+	}
+
+	spin_lock_irqsave(&dev->txq.lock, flags);
+	retval = usb_autopm_get_interface_async(dev->intf);
+	if (retval < 0) {
+		spin_unlock_irqrestore(&dev->txq.lock, flags);
+		goto drop;
+	}
+
+#ifdef CONFIG_PM
+	/* if this triggers the device is still a sleep */
+	if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
+		/* transmission will be done in resume */
+		usb_anchor_urb(urb, &dev->deferred);
+		/* no use to process more packets */
+		netif_stop_queue(net);
+		spin_unlock_irqrestore(&dev->txq.lock, flags);
+		netdev_dbg(dev->net, "Delaying transmission for resumption\n");
+		goto deferred;
+	}
+#endif
+
+	switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
+	case -EPIPE:
+		netif_stop_queue (net);
+		usbnet_defer_kevent (dev, EVENT_TX_HALT);
+		usb_autopm_put_interface_async(dev->intf);
+		break;
+	default:
+		usb_autopm_put_interface_async(dev->intf);
+		netif_dbg(dev, tx_err, dev->net,
+			  "tx: submit urb err %d\n", retval);
+		break;
+	case 0:
+		net->trans_start = jiffies;
+		__usbnet_queue_skb(&dev->txq, skb, tx_start);
+		if (dev->txq.qlen >= TX_QLEN (dev))
+			netif_stop_queue (net);
+	}
+	spin_unlock_irqrestore (&dev->txq.lock, flags);
+
+	if (retval) {
+		netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
+drop:
+		dev->net->stats.tx_dropped++;
+not_drop:
+		if (skb)
+			dev_kfree_skb_any (skb);
+		usb_free_urb (urb);
+	} else
+		netif_dbg(dev, tx_queued, dev->net,
+			  "> tx, len %d, type 0x%x\n", length, skb->protocol);
+#ifdef CONFIG_PM
+deferred:
+#endif
+	return NETDEV_TX_OK;
+}
+EXPORT_SYMBOL_GPL(usbnet_start_xmit);
+
+/*-------------------------------------------------------------------------*/
+
+// tasklet (work deferred from completions, in_irq) or timer
+
+static void usbnet_bh (unsigned long param)
+{
+	struct usbnet		*dev = (struct usbnet *) param;
+	struct sk_buff		*skb;
+	struct skb_data		*entry;
+
+	while ((skb = skb_dequeue (&dev->done))) {
+		entry = (struct skb_data *) skb->cb;
+		switch (entry->state) {
+		case rx_done:
+			entry->state = rx_cleanup;
+			rx_process (dev, skb);
+			continue;
+		case tx_done:
+		case rx_cleanup:
+			usb_free_urb (entry->urb);
+			dev_kfree_skb (skb);
+			continue;
+		default:
+			netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
+		}
+	}
+
+	// waiting for all pending urbs to complete?
+	if (dev->wait) {
+		if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
+			wake_up (dev->wait);
+		}
+
+	// or are we maybe short a few urbs?
+	} else if (netif_running (dev->net) &&
+		   netif_device_present (dev->net) &&
+		   !timer_pending (&dev->delay) &&
+		   !test_bit (EVENT_RX_HALT, &dev->flags)) {
+		int	temp = dev->rxq.qlen;
+		int	qlen = RX_QLEN (dev);
+
+		if (temp < qlen) {
+			struct urb	*urb;
+			int		i;
+
+			// don't refill the queue all at once
+			for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
+				urb = usb_alloc_urb (0, GFP_ATOMIC);
+				if (urb != NULL) {
+					if (rx_submit (dev, urb, GFP_ATOMIC) ==
+					    -ENOLINK)
+						return;
+				}
+			}
+			if (temp != dev->rxq.qlen)
+				netif_dbg(dev, link, dev->net,
+					  "rxqlen %d --> %d\n",
+					  temp, dev->rxq.qlen);
+			if (dev->rxq.qlen < qlen)
+				tasklet_schedule (&dev->bh);
+		}
+		if (dev->txq.qlen < TX_QLEN (dev))
+			netif_wake_queue (dev->net);
+	}
+}
+
+
+/*-------------------------------------------------------------------------
+ *
+ * USB Device Driver support
+ *
+ *-------------------------------------------------------------------------*/
+
+// precondition: never called in_interrupt
+
+void usbnet_disconnect (struct usb_interface *intf)
+{
+	struct usbnet		*dev;
+	struct usb_device	*xdev;
+	struct net_device	*net;
+
+	dev = usb_get_intfdata(intf);
+	usb_set_intfdata(intf, NULL);
+	if (!dev)
+		return;
+
+	xdev = interface_to_usbdev (intf);
+
+	netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
+		   intf->dev.driver->name,
+		   xdev->bus->bus_name, xdev->devpath,
+		   dev->driver_info->description);
+
+	net = dev->net;
+	unregister_netdev (net);
+
+	cancel_work_sync(&dev->kevent);
+
+	if (dev->driver_info->unbind)
+		dev->driver_info->unbind (dev, intf);
+
+	usb_kill_urb(dev->interrupt);
+	usb_free_urb(dev->interrupt);
+
+	free_netdev(net);
+	usb_put_dev (xdev);
+}
+EXPORT_SYMBOL_GPL(usbnet_disconnect);
+
+static const struct net_device_ops usbnet_netdev_ops = {
+	.ndo_open		= usbnet_open,
+	.ndo_stop		= usbnet_stop,
+	.ndo_start_xmit		= usbnet_start_xmit,
+	.ndo_tx_timeout		= usbnet_tx_timeout,
+	.ndo_change_mtu		= usbnet_change_mtu,
+	.ndo_set_mac_address 	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+/*-------------------------------------------------------------------------*/
+
+// precondition: never called in_interrupt
+
+static struct device_type wlan_type = {
+	.name	= "wlan",
+};
+
+static struct device_type wwan_type = {
+	.name	= "wwan",
+};
+
+int
+usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
+{
+	struct usbnet			*dev;
+	struct net_device		*net;
+	struct usb_host_interface	*interface;
+	struct driver_info		*info;
+	struct usb_device		*xdev;
+	int				status;
+	const char			*name;
+	struct usb_driver 	*driver = to_usb_driver(udev->dev.driver);
+
+	/* usbnet already took usb runtime pm, so have to enable the feature
+	 * for usb interface, otherwise usb_autopm_get_interface may return
+	 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
+	 */
+	if (!driver->supports_autosuspend) {
+		driver->supports_autosuspend = 1;
+		pm_runtime_enable(&udev->dev);
+	}
+
+	name = udev->dev.driver->name;
+	info = (struct driver_info *) prod->driver_info;
+	if (!info) {
+		dev_dbg (&udev->dev, "blacklisted by %s\n", name);
+		return -ENODEV;
+	}
+	xdev = interface_to_usbdev (udev);
+	interface = udev->cur_altsetting;
+
+	usb_get_dev (xdev);
+
+	status = -ENOMEM;
+
+#if 1
+    //huawei mu609,skip it's cdc ether device
+    if(xdev->descriptor.idVendor==0x12d1&&xdev->descriptor.idProduct==0x1573){
+        printk("skip %x:%x cdc ether\n",xdev->descriptor.idVendor,xdev->descriptor.idProduct);
+            goto out;        
+    }
+#else 
+{
+	char buf[256];
+	int varlen = 256;	
+    int disable = 0;
+	if( wmt_getsyspara("wmt.cdc.disable",buf,&varlen) == 0) 
+	{
+		sscanf(buf,"%d",&disable);
+        if(disable>0)
+            goto out;
+
+    }
+}
+#endif
+	// set up our own records
+	net = alloc_etherdev(sizeof(*dev));
+	if (!net)
+		goto out;
+
+	/* netdev_printk() needs this so do it as early as possible */
+	SET_NETDEV_DEV(net, &udev->dev);
+
+	dev = netdev_priv(net);
+	dev->udev = xdev;
+	dev->intf = udev;
+	dev->driver_info = info;
+	dev->driver_name = name;
+	dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
+				| NETIF_MSG_PROBE | NETIF_MSG_LINK);
+	skb_queue_head_init (&dev->rxq);
+	skb_queue_head_init (&dev->txq);
+	skb_queue_head_init (&dev->done);
+	skb_queue_head_init(&dev->rxq_pause);
+	dev->bh.func = usbnet_bh;
+	dev->bh.data = (unsigned long) dev;
+	INIT_WORK (&dev->kevent, kevent);
+	init_usb_anchor(&dev->deferred);
+	dev->delay.function = usbnet_bh;
+	dev->delay.data = (unsigned long) dev;
+	init_timer (&dev->delay);
+	mutex_init (&dev->phy_mutex);
+
+	dev->net = net;
+	strcpy (net->name, "usb%d");
+	memcpy (net->dev_addr, node_id, sizeof node_id);
+
+	/* rx and tx sides can use different message sizes;
+	 * bind() should set rx_urb_size in that case.
+	 */
+	dev->hard_mtu = net->mtu + net->hard_header_len;
+#if 0
+// dma_supported() is deeply broken on almost all architectures
+	// possible with some EHCI controllers
+	if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
+		net->features |= NETIF_F_HIGHDMA;
+#endif
+
+	net->netdev_ops = &usbnet_netdev_ops;
+	net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
+	net->ethtool_ops = &usbnet_ethtool_ops;
+
+	// allow device-specific bind/init procedures
+	// NOTE net->name still not usable ...
+	if (info->bind) {
+		status = info->bind (dev, udev);
+		if (status < 0)
+			goto out1;
+
+		// heuristic:  "usb%d" for links we know are two-host,
+		// else "eth%d" when there's reasonable doubt.  userspace
+		// can rename the link if it knows better.
+		if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
+		    ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
+		     (net->dev_addr [0] & 0x02) == 0))
+			strcpy (net->name, "eth%d");
+		/* WLAN devices should always be named "wlan%d" */
+		if ((dev->driver_info->flags & FLAG_WLAN) != 0)
+			strcpy(net->name, "wlan%d");
+		/* WWAN devices should always be named "wwan%d" */
+		if ((dev->driver_info->flags & FLAG_WWAN) != 0)
+			strcpy(net->name, "wwan%d");
+
+		/* maybe the remote can't receive an Ethernet MTU */
+		if (net->mtu > (dev->hard_mtu - net->hard_header_len))
+			net->mtu = dev->hard_mtu - net->hard_header_len;
+	} else if (!info->in || !info->out)
+		status = usbnet_get_endpoints (dev, udev);
+	else {
+		dev->in = usb_rcvbulkpipe (xdev, info->in);
+		dev->out = usb_sndbulkpipe (xdev, info->out);
+		if (!(info->flags & FLAG_NO_SETINT))
+			status = usb_set_interface (xdev,
+				interface->desc.bInterfaceNumber,
+				interface->desc.bAlternateSetting);
+		else
+			status = 0;
+
+	}
+	if (status >= 0 && dev->status)
+		status = init_status (dev, udev);
+	if (status < 0)
+		goto out3;
+
+	if (!dev->rx_urb_size)
+		dev->rx_urb_size = dev->hard_mtu;
+	dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
+
+	if ((dev->driver_info->flags & FLAG_WLAN) != 0)
+		SET_NETDEV_DEVTYPE(net, &wlan_type);
+	if ((dev->driver_info->flags & FLAG_WWAN) != 0)
+		SET_NETDEV_DEVTYPE(net, &wwan_type);
+
+	status = register_netdev (net);
+	if (status)
+		goto out4;
+	netif_info(dev, probe, dev->net,
+		   "register '%s' at usb-%s-%s, %s, %pM\n",
+		   udev->dev.driver->name,
+		   xdev->bus->bus_name, xdev->devpath,
+		   dev->driver_info->description,
+		   net->dev_addr);
+
+	// ok, it's ready to go.
+	usb_set_intfdata (udev, dev);
+
+	netif_device_attach (net);
+
+	if (dev->driver_info->flags & FLAG_LINK_INTR)
+		netif_carrier_off(net);
+
+	return 0;
+
+out4:
+	usb_free_urb(dev->interrupt);
+out3:
+	if (info->unbind)
+		info->unbind (dev, udev);
+out1:
+	free_netdev(net);
+out:
+	usb_put_dev(xdev);
+	return status;
+}
+EXPORT_SYMBOL_GPL(usbnet_probe);
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * suspend the whole driver as soon as the first interface is suspended
+ * resume only when the last interface is resumed
+ */
+
+int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
+{
+	struct usbnet		*dev = usb_get_intfdata(intf);
+
+	if (!dev->suspend_count++) {
+		spin_lock_irq(&dev->txq.lock);
+		/* don't autosuspend while transmitting */
+		if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
+			spin_unlock_irq(&dev->txq.lock);
+			return -EBUSY;
+		} else {
+			set_bit(EVENT_DEV_ASLEEP, &dev->flags);
+			spin_unlock_irq(&dev->txq.lock);
+		}
+		/*
+		 * accelerate emptying of the rx and queues, to avoid
+		 * having everything error out.
+		 */
+		netif_device_detach (dev->net);
+		usbnet_terminate_urbs(dev);
+		usb_kill_urb(dev->interrupt);
+
+		/*
+		 * reattach so runtime management can use and
+		 * wake the device
+		 */
+		netif_device_attach (dev->net);
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbnet_suspend);
+
+int usbnet_resume (struct usb_interface *intf)
+{
+	struct usbnet		*dev = usb_get_intfdata(intf);
+	struct sk_buff          *skb;
+	struct urb              *res;
+	int                     retval;
+
+	if (!--dev->suspend_count) {
+		/* resume interrupt URBs */
+		if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
+			usb_submit_urb(dev->interrupt, GFP_NOIO);
+
+		spin_lock_irq(&dev->txq.lock);
+		while ((res = usb_get_from_anchor(&dev->deferred))) {
+
+			skb = (struct sk_buff *)res->context;
+			retval = usb_submit_urb(res, GFP_ATOMIC);
+			if (retval < 0) {
+				dev_kfree_skb_any(skb);
+				usb_free_urb(res);
+				usb_autopm_put_interface_async(dev->intf);
+			} else {
+				dev->net->trans_start = jiffies;
+				__skb_queue_tail(&dev->txq, skb);
+			}
+		}
+
+		smp_mb();
+		clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
+		spin_unlock_irq(&dev->txq.lock);
+
+		if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
+			if (!(dev->txq.qlen >= TX_QLEN(dev)))
+				netif_tx_wake_all_queues(dev->net);
+			tasklet_schedule (&dev->bh);
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbnet_resume);
+
+
+/*-------------------------------------------------------------------------*/
+
+static int __init usbnet_init(void)
+{
+	/* Compiler should optimize this out. */
+	BUILD_BUG_ON(
+		FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
+
+	random_ether_addr(node_id);
+	return 0;
+}
+module_init(usbnet_init);
+
+static void __exit usbnet_exit(void)
+{
+}
+module_exit(usbnet_exit);
+
+MODULE_AUTHOR("David Brownell");
+MODULE_DESCRIPTION("USB network driver framework");
+MODULE_LICENSE("GPL");