linux-kernel - Re: [PATCH v2 5/6] net: dsa: add missing calls in dsa_switch

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Date:	Thu, 29 Oct 2015 15:06:35 +0100
From:	Neil Armstrong <narmstrong@...libre.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	vivien.didelot@...oirfairelinux.com,
	Fabian Frederick <fabf@...net.be>,
	Pavel Nakonechny <pavel.nakonechny@...tlab.ru>,
	Joe Perches <joe@...ches.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Frode Isaksen <fisaksen@...libre.com>
Subject: Re: [PATCH v2 5/6] net: dsa: add missing calls in dsa_switch_destroy

On 10/29/2015 03:00 PM, Andrew Lunn wrote:
> On Thu, Oct 29, 2015 at 02:23:25PM +0100, Neil Armstrong wrote:
>>
>> +		netif_carrier_off(ds->ports[port]);
>>  		unregister_netdev(ds->ports[port]);
>> +		phy_disconnect(p->phy);
>>  		free_netdev(ds->ports[port]);
>>  	}
> 
> Once you make it actually compile....
> 
> I'm not sure this is safe. The loop above this one has just destroyed
> some phys, and now you are potentially disconnecting a phy you just
> destroyed, causing it to be accessed?
> 
> I would suggest you first fix the ordering in dsa_switch_destroy()
> and then add the missing netif_carrier_off() and phy_disconnect().
> 
> Thanks
> 	Andrew
> 

Yes, you are right, I will submit a cleaned up version.
I forgot the fixed phy case actually.

Thanks,
Neil
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