netdev - [PATCH -next 3/4] net: w5100: increase TX timeout period

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Message-Id: <1462948227-21276-4-git-send-email-akinobu.mita@gmail.com>
Date:	Wed, 11 May 2016 15:30:26 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	netdev@...r.kernel.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	Mike Sinkovsky <msink@...monline.ru>,
	"David S . Miller" <davem@...emloft.net>
Subject: [PATCH -next 3/4] net: w5100: increase TX timeout period

This increases TX timeout period from one second to 5 seconds which is
default value defined in net/sched/sch_generic.c.

The one second timeout is too short for W5100 with SPI interface mode
which doesn't support burst READ/WRITE processing in the SPI transfer.
If the packet is transmitted while RX packets are being received at a
very high rate, the TX transmittion work in the workqueue is delayed
and the watchdog timer is expired.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Mike Sinkovsky <msink@...monline.ru>
Cc: David S. Miller <davem@...emloft.net>
---
 drivers/net/ethernet/wiznet/w5100.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
index c80438c..f649f1c 100644
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -1142,7 +1142,7 @@ int w5100_probe(struct device *dev, const struct w5100_ops *ops,
 
 	ndev->netdev_ops = &w5100_netdev_ops;
 	ndev->ethtool_ops = &w5100_ethtool_ops;
-	ndev->watchdog_timeo = HZ;
+	ndev->watchdog_timeo = 5 * HZ;
 	netif_napi_add(ndev, &priv->napi, w5100_napi_poll, 16);
 
 	/* This chip doesn't support VLAN packets with normal MTU,
-- 
2.7.4