linux-kernel - Re: [PATCH] net: smsc911x: Fix unload crash when link is up

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Message-ID: <20180306152345.GD30557@lunn.ch>
Date:   Tue, 6 Mar 2018 16:23:45 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jeremy Linton <jeremy.linton@....com>
Cc:     netdev@...r.kernel.org, steve.glendinning@...well.net,
        matt.sealey@....com, davem@...emloft.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: smsc911x: Fix unload crash when link is up

> This is caused by the mdiobus being unregistered/free'd
> and the code in phy_detach() attempting to manipulate mdio
> related structures from unregister_netdev() calling close()
> 
> To fix this, we delay the mdiobus teardown until after
> the netdev is deregistered.
> 
> Reported-by: Matt Sealey <matt.sealey@....com>
> Signed-off-by: Jeremy Linton <jeremy.linton@....com>
> ---
>  drivers/net/ethernet/smsc/smsc911x.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c
> index 012fb66eed8d..f0afb88d7bc2 100644
> --- a/drivers/net/ethernet/smsc/smsc911x.c
> +++ b/drivers/net/ethernet/smsc/smsc911x.c
> @@ -2335,14 +2335,14 @@ static int smsc911x_drv_remove(struct platform_device *pdev)
>  	pdata = netdev_priv(dev);
>  	BUG_ON(!pdata);
>  	BUG_ON(!pdata->ioaddr);
> -	WARN_ON(dev->phydev);

Hi Jeremy

I assume this WARN_ON() also fired? It would be good to comment about
why you removed it, that the code now handles that case.

Apart from that

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew