kaweth: Clean up code

The driver kaweth yields a -EBUSY error when starting, and a -ETIME
error when shutting down. These errors are avoided, and the RX status
is further checked for other potential errors.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/kaweth.c

@@ -31,7 +31,6 @@
  ****************************************************************/
 
 /* TODO:
- * Fix in_interrupt() problem
  * Develop test procedures for USB net interfaces
  * Run test procedures
  * Fix bugs from previous two steps
@@ -606,14 +605,30 @@ static void kaweth_usb_receive(struct urb *urb)
 
 	struct sk_buff *skb;
 
-	if(unlikely(status == -ECONNRESET || status == -ESHUTDOWN))
-	/* we are killed - set a flag and wake the disconnect handler */
-	{
+	if (unlikely(status == -EPIPE)) {
+		kaweth->stats.rx_errors++;
 		kaweth->end = 1;
 		wake_up(&kaweth->term_wait);
+		dbg("Status was -EPIPE.");
 		return;
 	}
-
+	if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
+		/* we are killed - set a flag and wake the disconnect handler */
+		kaweth->end = 1;
+		wake_up(&kaweth->term_wait);
+		dbg("Status was -ECONNRESET or -ESHUTDOWN.");
+		return;
+	}
+	if (unlikely(status == -EPROTO || status == -ETIME ||
+		     status == -EILSEQ)) {
+		kaweth->stats.rx_errors++;
+		dbg("Status was -EPROTO, -ETIME, or -EILSEQ.");
+		return;
+	}
+	if (unlikely(status == -EOVERFLOW)) {
+		kaweth->stats.rx_errors++;
+		dbg("Status was -EOVERFLOW.");
+	}
 	spin_lock(&kaweth->device_lock);
 	if (IS_BLOCKED(kaweth->status)) {
 		spin_unlock(&kaweth->device_lock);
@@ -883,13 +898,16 @@ static void kaweth_set_rx_mode(struct net_device *net)
  ****************************************************************/
 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 {
+	int result;
 	__u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
+
 	kaweth->packet_filter_bitmap = 0;
 	if (packet_filter_bitmap == 0)
 		return;
 
-	{
-	int result;
+	if (in_interrupt())
+		return;
+
 	result = kaweth_control(kaweth,
 				usb_sndctrlpipe(kaweth->dev, 0),
 				KAWETH_COMMAND_SET_PACKET_FILTER,
@@ -906,7 +924,6 @@ static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 	else {
 		dbg("Set Rx mode to %d", packet_filter_bitmap);
 	}
-	}
 }
 
 /****************************************************************