--- zzzz-none-000/linux-2.6.32.61/drivers/usb/class/cdc-wdm.c	2013-06-10 09:43:48.000000000 +0000
+++ ar10-7272-687/linux-2.6.32.61/drivers/usb/class/cdc-wdm.c	2013-02-11 17:46:15.000000000 +0000
@@ -52,7 +52,6 @@
 #define WDM_READ		4
 #define WDM_INT_STALL		5
 #define WDM_POLL_RUNNING	6
-#define WDM_OVERFLOW		10
 
 
 #define WDM_MAX			16
@@ -116,7 +115,6 @@
 {
 	struct wdm_device *desc = urb->context;
 	int status = urb->status;
-	int length = urb->actual_length;
 
 	spin_lock(&desc->iuspin);
 
@@ -146,17 +144,9 @@
 	}
 
 	desc->rerr = status;
-	if (length + desc->length > desc->wMaxCommand) {
-		/* The buffer would overflow */
-		set_bit(WDM_OVERFLOW, &desc->flags);
-	} else {
-		/* we may already be in overflow */
-		if (!test_bit(WDM_OVERFLOW, &desc->flags)) {
-			memmove(desc->ubuf + desc->length, desc->inbuf, length);
-			desc->length += length;
-			desc->reslength = length;
-		}
-	}
+	desc->reslength = urb->actual_length;
+	memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength);
+	desc->length += desc->reslength;
 	wake_up(&desc->wait);
 
 	set_bit(WDM_READ, &desc->flags);
@@ -408,11 +398,6 @@
 			rv = -ENODEV;
 			goto err;
 		}
-		if (test_bit(WDM_OVERFLOW, &desc->flags)) {
-			clear_bit(WDM_OVERFLOW, &desc->flags);
-			rv = -ENOBUFS;
-			goto err;
-		}
 		i++;
 		if (file->f_flags & O_NONBLOCK) {
 			if (!test_bit(WDM_READ, &desc->flags)) {
@@ -455,7 +440,6 @@
 			spin_unlock_irq(&desc->iuspin);
 			goto retry;
 		}
-
 		if (!desc->reslength) { /* zero length read */
 			dev_dbg(&desc->intf->dev, "%s: zero length - clearing WDM_READ\n", __func__);
 			clear_bit(WDM_READ, &desc->flags);
@@ -860,7 +844,6 @@
 	struct wdm_device *desc = usb_get_intfdata(intf);
 	int rv;
 
-	clear_bit(WDM_OVERFLOW, &desc->flags);
 	rv = recover_from_urb_loss(desc);
 	mutex_unlock(&desc->plock);
 	return 0;