[PATCH 6/7] rt2x00: Don't perform watchdog checks on empty queue

[Ivo van Doorn <ivdoorn@gmail.com>]

The currently used watchdog functions cannot be applied
to empty queues.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Helmut Schaa <helmut.schaa@googlemail.com>
---
 drivers/net/wireless/rt2x00/rt2x00usb.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 769c534..89d77f5 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -363,10 +363,12 @@ void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
 	struct data_queue *queue;
 
 	tx_queue_for_each(rt2x00dev, queue) {
-		if (rt2x00queue_dma_timeout(queue))
-			rt2x00usb_watchdog_tx_dma(queue);
-		if (rt2x00queue_timeout(queue))
-			rt2x00usb_watchdog_tx_status(queue);
+		if (!rt2x00queue_empty(queue)) {
+			if (rt2x00queue_dma_timeout(queue))
+				rt2x00usb_watchdog_tx_dma(queue);
+			if (rt2x00queue_timeout(queue))
+				rt2x00usb_watchdog_tx_status(queue);
+		}
 	}
 }
 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
-- 
1.7.2.3