rt2x00: Fix crash on USB unplug

By not scheduling the TX/RX completion worker threads
when Radio is disabled, or hardware has been unplugged,
the queues cannot be completely cleaned.

This causes crashes when the hardware has been unplugged while
the radio is still enabled.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -483,6 +483,10 @@ void rt2x00lib_rxdone(struct queue_entry *entry)
 	unsigned int header_length;
 	int rate_idx;
 
+	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
+	    !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
+		goto submit_entry;
+
 	if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 		goto submit_entry;
 
@@ -567,9 +571,13 @@ void rt2x00lib_rxdone(struct queue_entry *entry)
 	entry->skb = skb;
 
 submit_entry:
+	entry->flags = 0;
+	rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
+	if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
+	    test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) {
 		rt2x00dev->ops->lib->clear_entry(entry);
 		rt2x00queue_index_inc(entry->queue, Q_INDEX);
-	rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
+	}
 }
 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 

drivers/net/wireless/rt2x00/rt2x00usb.c

@@ -226,8 +226,6 @@ static void rt2x00usb_interrupt_txdone(struct urb *urb)
 	 * Schedule the delayed work for reading the TX status
 	 * from the device.
 	 */
-	if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
-	    test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
 }
 
@@ -409,8 +407,6 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 	 * Schedule the delayed work for reading the RX status
 	 * from the device.
 	 */
-	if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
-	    test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 }