[PATCH] FS_ENET: Don't attempt to set mii_speed when fec_inf is null

[Nye Liu]

From: Nye Liu <nyet at mrv.com>

When using CONFIG_FIXED_PHY, fec_inf (fep->phydev->bus->priv) is NULL in
fs_enet/mac-fec.c restart(). Dereferencing fec_inf when trying to set the
mii_speed causes a kernel oops.

Signed-off-by: Nye Liu <nyet at mrv.com>

---

diff --git a/drivers/net/fs_enet/mac-fec.c b/drivers/net/fs_enet/mac-fec.c
index 8a311d1..7359068 100644
--- a/drivers/net/fs_enet/mac-fec.c
+++ b/drivers/net/fs_enet/mac-fec.c
@@ -328,7 +328,8 @@ static void restart(struct net_device *dev)
 	/*
 	 * Set MII speed.
 	 */
-	FW(fecp, mii_speed, fec_inf->mii_speed);
+	if (fec_inf)
+		FW(fecp, mii_speed, fec_inf->mii_speed);
 
 	/*
 	 * Clear any outstanding interrupt.