staging: vt6655: change tx wake queue

Wake queue in the dwIsr loop of device_intr instead of device_tx_srv.

This fixes an issue when ISR_TXDMA0 or ISR_AC0DMA does not occur
device_tx_srv is not called and the queue gets stuck in stopped
condition.

On test if the queue is stuck another MACvTransmitAC0 or MACvTransmit0
in vnt_tx_packet will clear it.

Check on vif that both buffers are available and the queue is stopped.
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/device_main.c

@@ -1014,10 +1014,6 @@ static int device_tx_srv(struct vnt_private *pDevice, unsigned int uIdx)
 			}
 			device_free_tx_buf(pDevice, pTD);
 			pDevice->iTDUsed[uIdx]--;
-
-			/* Make sure queue is available */
-			if (AVAIL_TD(pDevice, uIdx))
-				ieee80211_wake_queues(pDevice->hw);
 		}
 	}
 
@@ -1190,6 +1186,14 @@ static  irqreturn_t  device_intr(int irq,  void *dev_instance)
 			}
 		}
 
+		/* If both buffers available wake the queue */
+		if (pDevice->vif) {
+			if (AVAIL_TD(pDevice, TYPE_TXDMA0) &&
+			    AVAIL_TD(pDevice, TYPE_AC0DMA) &&
+			    ieee80211_queue_stopped(pDevice->hw, 0))
+				ieee80211_wake_queues(pDevice->hw);
+		}
+
 		MACvReadISR(pDevice->PortOffset, &pDevice->dwIsr);
 
 		MACvReceive0(pDevice->PortOffset);