[PATCH] USBATM: handle urbs containing partial cells

The receive logic has always assumed that urbs contain an integral
number of ATM cells, which is a bit naughty, though it never caused
any problems with bulk transfers.  Isochronous urbs spank us soundly
for this.  Fixed thanks to this patch, mostly by Stanislaw Gruszka.
Signed-off-by: Duncan Sands <baldrick@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/atm/usbatm.h

@@ -187,6 +187,13 @@ struct usbatm_data {
 	struct sk_buff_head sndqueue;
 	struct sk_buff *current_skb;	/* being emptied */
 
+	struct usbatm_vcc_data *cached_vcc;
+	int cached_vci;
+	short cached_vpi;
+
+	unsigned char *cell_buf;	/* holds partial rx cell */
+	unsigned int buf_usage;
+
 	struct urb *urbs[0];
 };