rt2x00: Fix URB error handling

kill_urb guarentees that when the function returns, the URB has
been fully killed. This means we don't need the extra sleeping
after the call to kill_urb.

kill_urb can however also guarentee the submit_urb to fail, as
a result, we must catch the return value from submit_urb an
correctly mark the entry as owned by the driver, and the
status as broken.
Signed-off-by: NIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -253,6 +253,7 @@ EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 
 void rt2x00lib_dmadone(struct queue_entry *entry)
 {
+	clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 	rt2x00queue_index_inc(entry->queue, Q_INDEX_DMA_DONE);
 }
 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);

drivers/net/wireless/rt2x00/rt2x00usb.c

@@ -253,7 +253,10 @@ static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 			  entry->skb->data, length,
 			  rt2x00usb_interrupt_txdone, entry);
 
-	usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+	if (usb_submit_urb(entry_priv->urb, GFP_ATOMIC)) {
+		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+		rt2x00lib_dmadone(entry);
+	}
 }
 
 void rt2x00usb_kick_tx_queue(struct data_queue *queue)
@@ -280,14 +283,6 @@ static void rt2x00usb_kill_tx_entry(struct queue_entry *entry)
 	if ((entry->queue->qid == QID_BEACON) &&
 	    (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
 		usb_kill_urb(bcn_priv->guardian_urb);
-
-	/*
-	 * We need a short delay here to wait for
-	 * the URB to be canceled
-	 */
-	do {
-		udelay(100);
-	} while (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags));
 }
 
 void rt2x00usb_kill_tx_queue(struct data_queue *queue)
@@ -469,7 +464,10 @@ void rt2x00usb_clear_entry(struct queue_entry *entry)
 				rt2x00usb_interrupt_rxdone, entry);
 
 		set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
-		usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+		if (usb_submit_urb(entry_priv->urb, GFP_ATOMIC)) {
+			set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+			rt2x00lib_dmadone(entry);
+		}
 	}
 }
 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);