cdc_ether: Fix handling connection notification (d5c83d0d) · Commits · 戴 / test

Commit ("cdc_ether: Improve ZTE MF823/831/910 handling") introduced a work-around in usbnet_cdc_status() for devices that exported cdc carrier on twice on connect. Before the commit, this behavior caused the link state to be incorrect. It was assumed that all CDC Ethernet devices would either export this behavior, or send one off and then one on notification (which seems to be the default behavior). Unfortunately, it turns out multiple devices sends a connection notification multiple times per second (via an interrupt), even when connection state does not change. This has been observed with several different USB LAN dongles (at least), for example 13b1:0041 (Linksys). After , the link state has been set as down and then up for each notification. This has caused a flood of Netlink NEWLINK messages and syslog to be flooded with messages similar to: cdc_ether 2-1:2.0 eth1: kevent 12 may have been dropped This commit fixes the behavior by reverting usbnet_cdc_status() to how it was before . The work-around has been moved to a separate status-function which is only called when a known, affect device is detected. v1->v2: * Do not open-code netif_carrier_ok() (thanks Henning Schild). * Call netif_carrier_off() instead of usb_link_change(). This prevents calling schedule_work() twice without giving the work queue a chance to be processed (thanks Bjørn Mork). Fixes: ("cdc_ether: Improve ZTE MF823/831/910 handling") Reported-by:

Henning Schild <henning.schild@siemens.com> Signed-off-by:

Kristian Evensen <kristian.evensen@gmail.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

drivers/net/usb/cdc_ether.c

+31 −7

Original line number	Diff line number	Diff line
		@@ -388,12 +388,6 @@ void usbnet_cdc_status(struct usbnet dev, struct urb urb)
		case USB_CDC_NOTIFY_NETWORK_CONNECTION:
		netif_dbg(dev, timer, dev->net, "CDC: carrier %s\n",
		event->wValue ? "on" : "off");

		/* Work-around for devices with broken off-notifications */
		if (event->wValue &&
		!test_bit(__LINK_STATE_NOCARRIER, &dev->net->state))
		usbnet_link_change(dev, 0, 0);

		usbnet_link_change(dev, !!event->wValue, 0);
		break;
		case USB_CDC_NOTIFY_SPEED_CHANGE: /* tx/rx rates */
		@@ -466,6 +460,36 @@ static int usbnet_cdc_zte_rx_fixup(struct usbnet dev, struct sk_buff skb)
		return 1;
		}

		/* Ensure correct link state
		*
		* Some devices (ZTE MF823/831/910) export two carrier on notifications when
		* connected. This causes the link state to be incorrect. Work around this by
		* always setting the state to off, then on.
		*/
		void usbnet_cdc_zte_status(struct usbnet dev, struct urb urb)
		{
		struct usb_cdc_notification *event;

		if (urb->actual_length < sizeof(*event))
		return;

		event = urb->transfer_buffer;

		if (event->bNotificationType != USB_CDC_NOTIFY_NETWORK_CONNECTION) {
		usbnet_cdc_status(dev, urb);
		return;
		}

		netif_dbg(dev, timer, dev->net, "CDC: carrier %s\n",
		event->wValue ? "on" : "off");

		if (event->wValue &&
		netif_carrier_ok(dev->net))
		netif_carrier_off(dev->net);

		usbnet_link_change(dev, !!event->wValue, 0);
		}

		static const struct driver_info cdc_info = {
		.description = "CDC Ethernet Device",
		.flags = FLAG_ETHER \| FLAG_POINTTOPOINT,
		@@ -481,7 +505,7 @@ static const struct driver_info zte_cdc_info = {
		.flags = FLAG_ETHER \| FLAG_POINTTOPOINT,
		.bind = usbnet_cdc_zte_bind,
		.unbind = usbnet_cdc_unbind,
		.status = usbnet_cdc_status,
		.status = usbnet_cdc_zte_status,
		.set_rx_mode = usbnet_cdc_update_filter,
		.manage_power = usbnet_manage_power,
		.rx_fixup = usbnet_cdc_zte_rx_fixup,

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