openwrtv4/target/linux/mediatek/patches-4.4/0098-net-next-mediatek-only-trigger-the-tx-watchdog-reset.patch

From cd1343c14328a5de1a58c47b81b8a2febb31d542 Mon Sep 17 00:00:00 2001
From: John Crispin <john@phrozen.org>
Date: Tue, 10 May 2016 11:16:30 +0200
Subject: [PATCH 098/102] net-next: mediatek: only trigger the tx watchdog
 reset when all devices are stalled

Signed-off-by: Sean Wang <keyhaede@gmail.com>
Signed-off-by: John Crispin <john@phrozen.org>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c |   14 ++++++++++++--
 drivers/net/ethernet/mediatek/mtk_eth_soc.h |    1 +
 2 files changed, 13 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1267,11 +1267,21 @@ static void mtk_tx_timeout(struct net_de
 {
 	struct mtk_mac *mac = netdev_priv(dev);
 	struct mtk_eth *eth = mac->hw;
+	int i, reset = 0;
 
 	eth->netdev[mac->id]->stats.tx_errors++;
 	netif_err(eth, tx_err, dev,
 		  "transmit timed out\n");
-	schedule_work(&eth->pending_work);
+
+	for (i = 0; i < MTK_MAC_COUNT; i++) {
+		if (!eth->netdev[i] ||
+		    time_after(jiffies, dev_trans_start(eth->netdev[i]) +
+							MTK_WDT_TIMEOUT))
+			reset++;
+	}
+
+	if (reset == MTK_MAC_COUNT)
+		schedule_work(&eth->pending_work);
 }
 
 static irqreturn_t mtk_handle_irq_rx(int irq, void *_eth)
@@ -1765,7 +1775,7 @@ static int mtk_add_mac(struct mtk_eth *e
 	mac->hw_stats->reg_offset = id * MTK_STAT_OFFSET;
 
 	SET_NETDEV_DEV(eth->netdev[id], eth->dev);
-	eth->netdev[id]->watchdog_timeo = 5 * HZ;
+	eth->netdev[id]->watchdog_timeo = MTK_WDT_TIMEOUT;
 	eth->netdev[id]->netdev_ops = &mtk_netdev_ops;
 	eth->netdev[id]->base_addr = (unsigned long)eth->base;
 	eth->netdev[id]->vlan_features = MTK_HW_FEATURES &
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -15,6 +15,7 @@
 #ifndef MTK_ETH_H
 #define MTK_ETH_H
 
+#define MTK_WDT_TIMEOUT		(4 * HZ)
 #define MTK_QDMA_PAGE_SIZE	2048
 #define	MTK_MAX_RX_LENGTH	1536
 #define MTK_TX_DMA_BUF_LEN	0x3fff