netdev - Re: [PATCH net-next 1/2] net: linkwatch: add check for netdevice being present to linkwatch_do

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Date:   Wed, 19 Sep 2018 17:03:02 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH net-next 1/2] net: linkwatch: add check for netdevice
 being present to linkwatch_do_dev

On 09/18/2018 12:55 PM, Heiner Kallweit wrote:
> When bringing down the netdevice (incl. detaching it) and calling
> netif_carrier_off directly or indirectly the latter triggers an
> asynchronous linkwatch event.
> This linkwatch event eventually may fail to access chip registers in
> the ndo_get_stats/ndo_get_stats64 callback because the device isn't
> accessible any longer, see call trace in [0].
> 
> To prevent this scenario don't check for IFF_UP only, but also make
> sure that the netdevice is present.
> 
> [0] https://lists.openwall.net/netdev/2018/03/15/62
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

Thanks Heiner!
-- 
Florian