Re: [PATCH net-next v2] net: phy: probe PHY drivers synchronously

[Andrew Lunn <andrew@lunn.ch>]

On Fri, Mar 27, 2020 at 01:00:22AM +0100, Heiner Kallweit wrote:
> If we have scenarios like
> 
> mdiobus_register()
> 	-> loads PHY driver module(s)
> 	-> registers PHY driver(s)
> 	-> may schedule async probe
> phydev = mdiobus_get_phy()
> <phydev action involving PHY driver>
> 
> or
> 
> phydev = phy_device_create()
> 	-> loads PHY driver module
> 	-> registers PHY driver
> 	-> may schedule async probe
> <phydev action involving PHY driver>
> 
> then we expect the PHY driver to be bound to the phydev when triggering
> the action. This may not be the case in case of asynchronous probing.
> Therefore ensure that PHY drivers are probed synchronously.
> 
> Default still is sync probing, except async probing is explicitly
> requested. I saw some comments that the intention is to promote
> async probing for more parallelism in boot process and want to be
> prepared for the case that the default is changed to async probing.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

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

    Andrew