From: Ivo van Doorn <ivdoorn@gmail.com>
Date: Thu, 4 Nov 2010 19:41:05 +0000 (+0100)
Subject: rt2x00: Fix crash on USB unplug
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=070192dd2975c0e97bbdeac7623b755235c6db7d;p=linux-edison.git

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>
---

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 5ba79b935f0..0f34d996975 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/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:
-	rt2x00dev->ops->lib->clear_entry(entry);
-	rt2x00queue_index_inc(entry->queue, Q_INDEX);
+	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);
+	}
 }
 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 6dd96192dd9..9ac14598e2a 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -226,9 +226,7 @@ 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);
+	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
 }
 
 static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
@@ -409,9 +407,7 @@ 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);
+	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
 }
 
 /*