linux-kernel - [PATCH] gianfar: keep vlan related state when reenabled

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Date:	Sun, 12 Jul 2009 14:56:56 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	galak@...nel.crashing.org
Cc:	linux-net@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] gianfar: keep vlan related state when reenabled

If vlan has been enabled. ifdown followed by ifup will lost hardware
related state.

remove duplicated operation in gfar_vlan_rx_register().

Signed-off-by: Yong Zhang <yong.zhang0@...il.com>
---
 drivers/net/gianfar.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 4ae1d25..9cc6dd3 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -942,6 +942,7 @@ int startup_gfar(struct net_device *dev)
 	struct gfar __iomem *regs = priv->regs;
 	int err = 0;
 	u32 rctrl = 0;
+	u32 tctrl = 0;
 	u32 attrs = 0;

 	gfar_write(&regs->imask, IMASK_INIT_CLEAR);
@@ -1117,11 +1118,19 @@ int startup_gfar(struct net_device *dev)
 		rctrl |= RCTRL_PADDING(priv->padding);
 	}

+	/* keep vlan related bits if it's enabled */
+	if (priv->vlgrp) {
+		rctrl |= RCTRL_VLEX | RCTRL_PRSDEP_INIT;
+		tctrl |= TCTRL_VLINS;
+	}
+
 	/* Init rctrl based on our settings */
 	gfar_write(&priv->regs->rctrl, rctrl);

 	if (dev->features & NETIF_F_IP_CSUM)
-		gfar_write(&priv->regs->tctrl, TCTRL_INIT_CSUM);
+		tctrl |= TCTRL_INIT_CSUM;
+
+	gfar_write(&priv->regs->tctrl, tctrl);

 	/* Set the extraction length and index */
 	attrs = ATTRELI_EL(priv->rx_stash_size) |
@@ -1456,7 +1465,6 @@ static void gfar_vlan_rx_register(struct net_device *dev,

 		/* Enable VLAN tag extraction */
 		tempval = gfar_read(&priv->regs->rctrl);
-		tempval |= RCTRL_VLEX;
 		tempval |= (RCTRL_VLEX | RCTRL_PRSDEP_INIT);
 		gfar_write(&priv->regs->rctrl, tempval);
 	} else {
-- 
1.6.0.4
--
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