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

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Date:   Thu, 26 Mar 2020 19:43:46 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     hkallweit1@...il.com
Cc:     andrew@...n.ch, f.fainelli@...il.com, linux@...linux.org.uk,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: phy: probe PHY drivers synchronously

From: Heiner Kallweit <hkallweit1@...il.com>
Date: Fri, 27 Mar 2020 01:00:22 +0100

> 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@...il.com>

Applied, thanks Heiner.