From a1f14d6216762bc9ba14eff88d6709544d96aaeb Mon Sep 17 00:00:00 2001
From: Alexander Kochetkov <al.kochet@gmail.com>
Date: Tue, 9 Feb 2016 18:20:39 +0300
Subject: [PATCH] UPSTREAM: net: arc_emac: reset txbd_curr and txbd_dirty
pointers to zero
EMAC reset internal tx ring pointer to zero at statup.
txbd_curr and txbd_dirty can be different from zero.
That cause ethernet transfer hang (no packets transmitted).
In order to reproduce, run on device:
ifconfig eth0 down
ifconfig eth0 up
Change-Id: Ie37cbd4761f8df216b2ddc5d07c0d6f036ac7092
Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
(cherry picked from git.kernel.org next/linux-next.git master
commit 99f93a156a2aa9ac1e44f7cb1a197425e6d9879a)
---
drivers/net/ethernet/arc/emac_main.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index 63a63e31d59d..4f6e5be184df 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -447,6 +447,9 @@ static int arc_emac_open(struct net_device *ndev)
*last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
}
+ priv->txbd_curr = 0;
+ priv->txbd_dirty = 0;
+
/* Clean Tx BD's */
memset(priv->txbd, 0, TX_RING_SZ);
--
2.34.1