lkml.org 
[lkml]   [2018]   [Mar]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 0/2] net: phy: relax error checking when creating sysfs link netdev->phydev
From
Date


On 03/16/2018 10:22 AM, Andrew Lunn wrote:
> On Wed, Mar 14, 2018 at 05:26:22PM -0500, Grygorii Strashko wrote:
>> Some ethernet drivers (like TI CPSW) may connect and manage >1 Net PHYs per
>> one netdevice, as result such drivers will produce warning during system
>> boot and fail to connect second phy to netdevice when PHYLIB framework
>> will try to create sysfs link netdev->phydev for second PHY
>> in phy_attach_direct(), because sysfs link with the same name has been
>> created already for the first PHY.
>> As result, second CPSW external port will became unusable.
>> This issue was introduced by commits:
>> 5568363f0cb3 ("net: phy: Create sysfs reciprocal links for attached_dev/phydev"
>> a3995460491d ("net: phy: Relax error checking on sysfs_create_link()"
>
> I wonder if it would be better to add a flag to the phydev that
> indicates it is the second PHY connected to a MAC? Add a bit to
> phydrv->mdiodrv.flags. If that bit is set, don't create the sysfs
> file.

We could indeed do that, I am fine with Grygorii's approach though in
making the creation more silent and non fatal.

>
> For 99% of MAC drivers, having two PHYs is an error, so we want to aid
> debug by reporting the sysfs error.
That is true, either way is fine with me, really.
--
Florian

\
 
 \ /
  Last update: 2018-03-16 18:35    [W:0.113 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site