linux-kernel - [PATCH] FS_ENET: Don't attempt to set mii_speed when fec

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Message-ID: <20080627192651.GA28291@curtisfong.org>
Date:	Fri, 27 Jun 2008 12:26:51 -0700
From:	Nye Liu <nyet@...t.org>
To:	linux-kernel@...r.kernel.org
Cc:	pantelis.antoniou@...il.com, linuxppc-dev@...abs.org,
	netdev@...r.kernel.org
Subject: [PATCH] FS_ENET: Don't attempt to set mii_speed when fec_inf is
	null

From: Nye Liu <nyet@....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@....com>

---

diff --git a/drivers/net/fs_enet/mac-fec.c b/drivers/net/fs_enet/mac-fec.c
index 8a311d1..350bc73 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.

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