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>

1 files changed, 17 insertions, 11 deletions

diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index eea75a401b0c..8fecf1b817f7 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;
 }