ar71xx: prevent spurious ethernet resets from dma hang check false positives

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h

@@ -174,7 +174,7 @@ struct ag71xx {
 	unsigned int		desc_pktlen_mask;
 	unsigned int		rx_buf_size;
 
-	struct work_struct	restart_work;
+	struct delayed_work	restart_work;
 	struct delayed_work	link_work;
 	struct timer_list	oom_timer;
 

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c

@@ -908,12 +908,12 @@ static void ag71xx_tx_timeout(struct net_device *dev)
 	if (netif_msg_tx_err(ag))
 		pr_info("%s: tx timeout\n", ag->dev->name);
 
-	schedule_work(&ag->restart_work);
+	schedule_delayed_work(&ag->restart_work, 1);
 }
 
 static void ag71xx_restart_work_func(struct work_struct *work)
 {
-	struct ag71xx *ag = container_of(work, struct ag71xx, restart_work);
+	struct ag71xx *ag = container_of(work, struct ag71xx, restart_work.work);
 
 	rtnl_lock();
 	ag71xx_hw_disable(ag);
@@ -966,7 +966,7 @@ static int ag71xx_tx_packets(struct ag71xx *ag, bool flush)
 		if (!flush && !ag71xx_desc_empty(desc)) {
 			if (pdata->is_ar724x &&
 			    ag71xx_check_dma_stuck(ag, ring->buf[i].timestamp))
-				schedule_work(&ag->restart_work);
+				schedule_delayed_work(&ag->restart_work, HZ / 2);
 			break;
 		}
 
@@ -1002,6 +1002,7 @@ static int ag71xx_tx_packets(struct ag71xx *ag, bool flush)
 	netdev_completed_queue(ag->dev, sent, bytes_compl);
 	if ((ring->curr - ring->dirty) < (ring_size * 3) / 4)
 		netif_wake_queue(ag->dev);
+	cancel_delayed_work(&ag->restart_work);
 
 	return sent;
 }
@@ -1321,7 +1322,7 @@ static int ag71xx_probe(struct platform_device *pdev)
 	dev->netdev_ops = &ag71xx_netdev_ops;
 	dev->ethtool_ops = &ag71xx_ethtool_ops;
 
-	INIT_WORK(&ag->restart_work, ag71xx_restart_work_func);
+	INIT_DELAYED_WORK(&ag->restart_work, ag71xx_restart_work_func);
 
 	init_timer(&ag->oom_timer);
 	ag->oom_timer.data = (unsigned long) dev;