gianfar: Fix race in TBI/SerDes configuration

[linux-2.6-omap-h63xx.git] / drivers / net / gianfar.c

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 64b201134fdb85e5f93248644fecfaf7e91969fc..249541a1814b6823e98b079b6b0ae061723aa3bf 100644 (file)
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -586,6 +586,10 @@ static void gfar_configure_serdes(struct net_device *dev)
        struct gfar_mii __iomem *regs =
                        (void __iomem *)&priv->regs->gfar_mii_regs;
        int tbipa = gfar_read(&priv->regs->tbipa);
+       struct mii_bus *bus = gfar_get_miibus(priv);
+
+       if (bus)
+               mutex_lock(&bus->mdio_lock);
 
        /* Single clk mode, mii mode off(for serdes communication) */
        gfar_local_mdio_write(regs, tbipa, MII_TBICON, TBICON_CLK_SELECT);
@@ -596,6 +600,9 @@ static void gfar_configure_serdes(struct net_device *dev)
 
        gfar_local_mdio_write(regs, tbipa, MII_BMCR, BMCR_ANENABLE |
                        BMCR_ANRESTART | BMCR_FULLDPLX | BMCR_SPEED1000);
+
+       if (bus)
+               mutex_unlock(&bus->mdio_lock);
 }
 
 static void init_registers(struct net_device *dev)