cdc_subset: deal with a device that needs reset for timeout

This device needs to be reset to recover from a timeout.
Unfortunately this can be handled only at the level of
the subdrivers.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/cdc_subset.c

@@ -85,9 +85,34 @@ static int always_connected (struct usbnet *dev)
  *
  *-------------------------------------------------------------------------*/
 
+static void m5632_recover(struct usbnet *dev)
+{
+	struct usb_device	*udev = dev->udev;
+	struct usb_interface	*intf = dev->intf;
+	int r;
+
+	r = usb_lock_device_for_reset(udev, intf);
+	if (r < 0)
+		return;
+
+	usb_reset_device(udev);
+	usb_unlock_device(udev);
+}
+
+static int dummy_prereset(struct usb_interface *intf)
+{
+	return 0;
+}
+
+static int dummy_postreset(struct usb_interface *intf)
+{
+	return 0;
+}
+
 static const struct driver_info	ali_m5632_info = {
 	.description =	"ALi M5632",
 	.flags       = FLAG_POINTTOPOINT,
+	.recover     = m5632_recover,
 };
 
 #endif
@@ -332,6 +357,8 @@ static struct usb_driver cdc_subset_driver = {
 	.probe =	usbnet_probe,
 	.suspend =	usbnet_suspend,
 	.resume =	usbnet_resume,
+	.pre_reset =	dummy_prereset,
+	.post_reset =	dummy_postreset,
 	.disconnect =	usbnet_disconnect,
 	.id_table =	products,
 	.disable_hub_initiated_lpm = 1,

drivers/net/usb/usbnet.c

@@ -1218,8 +1218,12 @@ void usbnet_tx_timeout (struct net_device *net)
 
 	unlink_urbs (dev, &dev->txq);
 	tasklet_schedule (&dev->bh);
-
-	// FIXME: device recovery -- reset?
+	/* this needs to be handled individually because the generic layer
+	 * doesn't know what is sufficient and could not restore private
+	 * information if a remedy of an unconditional reset were used.
+	 */
+	if (dev->driver_info->recover)
+		(dev->driver_info->recover)(dev);
 }
 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
 

include/linux/usb/usbnet.h

@@ -148,6 +148,9 @@ struct driver_info {
 	struct sk_buff	*(*tx_fixup)(struct usbnet *dev,
 				struct sk_buff *skb, gfp_t flags);
 
+	/* recover from timeout */
+	void	(*recover)(struct usbnet *dev);
+
 	/* early initialization code, can sleep. This is for minidrivers
 	 * having 'subminidrivers' that need to do extra initialization
 	 * right after minidriver have initialized hardware. */