> 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.sea...@arm.com>
> Signed-off-by: Jeremy Linton <jeremy.lin...@arm.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 <and...@lunn.ch>

    Andrew

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