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

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Date:	Fri, 27 Jun 2008 15:07:49 -0700
From:	Nye Liu <nyet@...t.org>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] FS_ENET: Don't attempt to set mii_speed when fec_inf
	is null

Sorry!

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.

On Sat, Jun 28, 2008 at 01:29:16AM +0400, Sergei Shtylyov wrote:
> Hello.
>
> Nye Liu wrote:
>> 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);
>>   
>
>   Alas, Your patch is whitespace damaged.
>
>
> WBR, Sergei
>
>
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