netdev - Re: [PATCH for 2.6.24][NET] fs_enet: check for phydev existence in the ethtool handlers

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Message-Id: <1199875566.3408.11.camel@p60365-ste>
Date:	Wed, 09 Jan 2008 11:46:06 +0100
From:	Sergej Stepanov <Sergej.Stepanov@....de>
To:	avorontsov@...mvista.com
Cc:	Jeff Garzik <jeff@...zik.org>, netdev@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH for 2.6.24][NET] fs_enet: check for phydev existence in
	the ethtool handlers


Am Dienstag, den 08.01.2008, 22:05 +0300 schrieb Anton Vorontsov:
> Otherwise oops will happen if ethernet device has not been opened:
> 
> Unable to handle kernel paging request for data at address 0x0000014c
> Faulting instruction address: 0xc016f7f0
> Oops: Kernel access of bad area, sig: 11 [#1]
> MPC85xx
> NIP: c016f7f0 LR: c01722a0 CTR: 00000000
> REGS: c79ddc70 TRAP: 0300   Not tainted  (2.6.24-rc3-g820a386b)
> MSR: 00029000 <EE,ME>  CR: 20004428  XER: 20000000
> DEAR: 0000014c, ESR: 00000000
> TASK = c789f5e0[999] 'snmpd' THREAD: c79dc000
> GPR00: c01aceb8 c79ddd20 c789f5e0 00000000 c79ddd3c 00000000 c79ddd64 00000000
> GPR08: 00000000 c7845b60 c79dde3c c01ace80 20004422 200249fc 000002a0 100da728
> GPR16: 100c0000 00000000 00000000 00000000 20022078 00000009 200220e0 bfc85558
> GPR24: c79ddd3c 00000000 00000000 c02e0e70 c022fc64 ffffffff c7845800 bfc85498
> NIP [c016f7f0] phy_ethtool_gset+0x0/0x4c
> LR [c01722a0] fs_get_settings+0x18/0x28
> Call Trace:
> [c79ddd20] [c79dde38] 0xc79dde38 (unreliable)
> [c79ddd30] [c01aceb8] dev_ethtool+0x294/0x11ec
> [c79dde30] [c01aaa44] dev_ioctl+0x454/0x6a8
> [c79ddeb0] [c019b9d4] sock_ioctl+0x84/0x230
> [c79dded0] [c007ded8] do_ioctl+0x34/0x8c
> [c79ddee0] [c007dfbc] vfs_ioctl+0x8c/0x41c
> [c79ddf10] [c007e38c] sys_ioctl+0x40/0x74
> [c79ddf40] [c000d4c0] ret_from_syscall+0x0/0x3c
> Instruction dump:
> 81630000 800b0030 2f800000 419e0010 7c0803a6 4e800021 7c691b78 80010014
> 7d234b78 38210010 7c0803a6 4e800020 <8003014c> 7c6b1b78 38600000 90040004
> 
> Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
> Acked-by: Vitaly Bordug <vitb@...nel.crashing.org>
> ---
> 
> Just resending it, it feels like it got lost during holidays.
> 
>  drivers/net/fs_enet/fs_enet-main.c |   11 +++++++++--
>  1 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
> index f2a4d39..23fddc3 100644
> --- a/drivers/net/fs_enet/fs_enet-main.c
> +++ b/drivers/net/fs_enet/fs_enet-main.c
> @@ -897,14 +897,21 @@ static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
>  static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
>  {
>  	struct fs_enet_private *fep = netdev_priv(dev);
> +
> +	if (!fep->phydev)
> +		return -ENODEV;
> +
>  	return phy_ethtool_gset(fep->phydev, cmd);
>  }
>  
>  static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
>  {
>  	struct fs_enet_private *fep = netdev_priv(dev);
> -	phy_ethtool_sset(fep->phydev, cmd);
> -	return 0;
> +
> +	if (!fep->phydev)
> +		return -ENODEV;
> +
> +	return phy_ethtool_sset(fep->phydev, cmd);
>  }
>  
>  static int fs_nway_reset(struct net_device *dev)

I got also oops problem with the driver.
What could be false?
After the following patch it functions.
Thanks for any advance.

diff --git a/drivers/net/fs_enet/fs_enet-main.c
b/drivers/net/fs_enet/fs_enet-main.c
index f2a4d39..d5081b1 100644
--- a/drivers/net/fs_enet/fs_enet-main.c
+++ b/drivers/net/fs_enet/fs_enet-main.c
@@ -99,6 +99,8 @@ static int fs_enet_rx_napi(struct napi_struct *napi,
int budget)
        if (!netif_running(dev))
                return 0;
 
+       if (fep->cur_rx == NULL)
+               return 0;
        /*
         * First, grab all of the stats for the incoming packet.
         * These get messed up if we get called due to a busy condition.


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