[PATCH] USB speedtouch: Fix speedtouch maxi race

Instead of trying to close all ATM connections in the USB disconnect routine,
just notify the ATM layer that the ATM device should go down when the last
connection is closed.  This should be the last big speedtouch stability fix.

drivers/usb/misc/speedtouch.c

@@ -202,6 +202,7 @@ static int udsl_print_packet (const unsigned char *data, int len);
  * atm driver prototypes and stuctures
  */
 
+static void udsl_atm_dev_close (struct atm_dev *dev);
 static int udsl_atm_open (struct atm_vcc *vcc, short vpi, int vci);
 static void udsl_atm_close (struct atm_vcc *vcc);
 static int udsl_atm_ioctl (struct atm_dev *dev, unsigned int cmd, void *arg);
@@ -209,6 +210,7 @@ static int udsl_atm_send (struct atm_vcc *vcc, struct sk_buff *skb);
 static int udsl_atm_proc_read (struct atm_dev *atm_dev, loff_t *pos, char *page);
 
 static struct atmdev_ops udsl_atm_devops = {
+	.dev_close =	udsl_atm_dev_close,
 	.open =		udsl_atm_open,
 	.close =	udsl_atm_close,
 	.ioctl =	udsl_atm_ioctl,
@@ -691,24 +693,21 @@ static int udsl_atm_send (struct atm_vcc *vcc, struct sk_buff *skb)
 *
 ****************************************************************************/
 
-static void udsl_atm_stopdevice (struct udsl_instance_data *instance)
+static void udsl_atm_dev_close (struct atm_dev *dev)
 {
-	struct atm_vcc *walk;
-	struct atm_dev *atm_dev;
+	struct udsl_instance_data *instance = dev->dev_data;
 
-	if (!instance->atm_dev)
+	if (!instance) {
+		PDEBUG ("udsl_atm_dev_close: NULL instance!\n");
 		return;
+	}
 
-	atm_dev = instance->atm_dev;
-
-	atm_dev->signal = ATM_PHY_SIG_LOST;
-	walk = atm_dev->vccs;
-	shutdown_atm_dev (atm_dev);
-
-	for (; walk; walk = walk->next)
-		wake_up (&walk->sleep);
+	PDEBUG ("udsl_atm_dev_close: queue has %u elements\n", instance->sndqueue.qlen);
 
-	instance->atm_dev = NULL;
+	PDEBUG ("udsl_atm_dev_close: killing tasklet\n");
+	tasklet_kill (&instance->receive_tasklet);
+	PDEBUG ("udsl_atm_dev_close: freeing instance\n");
+	kfree (instance);
 }
 
 
@@ -1038,7 +1037,7 @@ static void udsl_usb_disconnect (struct usb_interface *intf)
 
 	tasklet_disable (&instance->receive_tasklet);
 
-	/* flush spare receivers */
+	/* receive finalize */
 	down (&instance->serialize); /* vs udsl_fire_receivers */
 	/* no need to take the spinlock */
 	list_for_each (pos, &instance->spare_receivers)
@@ -1088,8 +1087,7 @@ static void udsl_usb_disconnect (struct usb_interface *intf)
 		kfree_skb (rcv->skb);
 	}
 
-	udsl_atm_stopdevice (instance);
-
+	/* send finalize */
 	tasklet_disable (&instance->send_tasklet);
 
 	for (i = 0; i < UDSL_NUMBER_SND_URBS; i++)
@@ -1120,7 +1118,6 @@ static void udsl_usb_disconnect (struct usb_interface *intf)
 	instance->current_buffer = NULL;
 
 	tasklet_enable (&instance->receive_tasklet);
-	tasklet_kill (&instance->receive_tasklet);
 
 	PDEBUG ("udsl_usb_disconnect: freeing senders\n");
 	for (i = 0; i < UDSL_NUMBER_SND_URBS; i++)
@@ -1130,8 +1127,8 @@ static void udsl_usb_disconnect (struct usb_interface *intf)
 	for (i = 0; i < UDSL_NUMBER_SND_BUFS; i++)
 		kfree (instance->all_buffers[i].base);
 
-	PDEBUG ("udsl_usb_disconnect: freeing instance\n");
-	kfree (instance);
+	/* atm finalize */
+	shutdown_atm_dev (instance->atm_dev);
 }