netdev - Re: [PATCH 1/2] r8169: reinstate ALDPS for power saving

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Message-ID: <20171115233343.GA28812@electric-eye.fr.zoreil.com>
Date:   Thu, 16 Nov 2017 00:33:43 +0100
From:   Francois Romieu <romieu@...zoreil.com>
To:     David Miller <davem@...emloft.net>
Cc:     kai.heng.feng@...onical.com, nic_swsd@...ltek.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        hayeswang@...ltek.com, jrg.otte@...il.com
Subject: Re: [PATCH 1/2] r8169: reinstate ALDPS for power saving

David Miller <davem@...emloft.net> :
[...]
> The amount of coverage this change is going to get is very small as
> well, meaning an even greater chance of regressions.

Yes.

> Therefore the only acceptable way to handle this is to have
> a white-list, specific chips that have been explicitly tested
> and are known to work with this feature, rather than the other
> way around.
> 
> Furthermore, you're not even checking the chip version, you're
> checking instead whether the firmware is loaded or not.  That
> doesn't seem like a safe way to guard this at all.

Actually the chip specific xyz_hw_phy_config methods call the relevant
aldps enabling helper _but_ the 8168evl dedicated xyz_hw_phy_config
doesn't. The firmware loaded check is just a distraction for the
busy reviewer.

-- 
Ueimor