From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Mon, 12 Mar 2007 22:16:26 +0000 (-0700)
Subject: skge: set mac address bonding fix
X-Git-Tag: v2.6.21-rc4~1^2~5
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2eb3e621c4e07e9e7200dbb66f0433b4caafb8e7;p=linux-2.6

skge: set mac address bonding fix

When bonding does fail over it calls set_mac_address.  When this happens
as the result of another port going down, the phy_mutex that is common to
both ports is held, so it deadlocks. Setting the address doesn't need to do
anything that needs the phy_mutex, it already has the RTNL to protect against
other admin actions.

This change just disables the receiver to avoid any hardware confusion
while address is changing.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index eea75a401b..8fecf1b817 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -3275,24 +3275,30 @@ static int skge_set_mac_address(struct net_device *dev, void *p)
 	struct skge_hw *hw = skge->hw;
 	unsigned port = skge->port;
 	const struct sockaddr *addr = p;
+	u16 ctrl;
 
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	mutex_lock(&hw->phy_mutex);
 	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
-	memcpy_toio(hw->regs + B2_MAC_1 + port*8,
-		    dev->dev_addr, ETH_ALEN);
-	memcpy_toio(hw->regs + B2_MAC_2 + port*8,
-		    dev->dev_addr, ETH_ALEN);
 
-	if (hw->chip_id == CHIP_ID_GENESIS)
-		xm_outaddr(hw, port, XM_SA, dev->dev_addr);
-	else {
-		gma_set_addr(hw, port, GM_SRC_ADDR_1L, dev->dev_addr);
-		gma_set_addr(hw, port, GM_SRC_ADDR_2L, dev->dev_addr);
+	/* disable Rx */
+	ctrl = gma_read16(hw, port, GM_GP_CTRL);
+	gma_write16(hw, port, GM_GP_CTRL, ctrl & ~GM_GPCR_RX_ENA);
+
+	memcpy_toio(hw->regs + B2_MAC_1 + port*8, dev->dev_addr, ETH_ALEN);
+	memcpy_toio(hw->regs + B2_MAC_2 + port*8, dev->dev_addr, ETH_ALEN);
+
+	if (netif_running(dev)) {
+		if (hw->chip_id == CHIP_ID_GENESIS)
+			xm_outaddr(hw, port, XM_SA, dev->dev_addr);
+		else {
+			gma_set_addr(hw, port, GM_SRC_ADDR_1L, dev->dev_addr);
+			gma_set_addr(hw, port, GM_SRC_ADDR_2L, dev->dev_addr);
+		}
 	}
-	mutex_unlock(&hw->phy_mutex);
+
+	gma_write16(hw, port, GM_GP_CTRL, ctrl);
 
 	return 0;
 }