linux-kernel - Re: [PATCH v1 1/2] modpost: file2alias: fixup mdio alias garbled code in modules.alias

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Date:   Tue, 23 Nov 2021 10:21:54 +0800
From:   zhuyinbo <zhuyinbo@...ngson.cn>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        zhuyinbo@...ngson.cn, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v1 1/2] modpost: file2alias: fixup mdio alias garbled code
 in modules.alias


在 2021/11/22 下午10:07, Andrew Lunn 写道:
> On Mon, Nov 22, 2021 at 08:14:57PM +0800, Yinbo Zhu wrote:
>> After module compilation, module alias mechanism will generate a ugly
>> mdio modules alias configure if ethernet phy was selected, this patch
>> is to fixup mdio alias garbled code.
>>
>> In addition, that ugly alias configure will cause ethernet phy module
>> doens't match udev, phy module auto-load is fail, but add this patch
>> that it is well mdio driver alias configure match phy device uevent.
> What PHY do you have problems with? What is the PHY id and which
> driver should be loaded.

     about that phy id,  phy dev read it from  PHY Identifier 1 and 
Identifier 2 register, phy driver will call MODULE_DEVICE_TABLE to 
configure

     phy id to mdio_device_id, phy id was used to do a match phy driver 
with phy device.  that phy problems is phy driver was select 'M' then it

     doesn't be auto load.
> This code has existed a long time, so suddenly saying it is wrong and
> changing it needs a good explanation why it is wrong. Being ugly is
> not a good reason.
>
>      Andrew

Hi Andrew,

     Use default mdio configure, After module compilation, mdio alias 
configure is "alias mdio:0000000101000001000011111001???? marvell"

     and it doesn't match  the match phy dev(mdio dev)  uevent, because 
the mdio alias configure "0000000101000001000011111001????"

    include "?" and  "binary number",   as general, uevent it include 
one string or some string that string consist of one character and one 
hexadecimal digit ,

     which uevent is reported by mdio when mdio register a device for 
ethernet phy device, only uevent from phy dev match alias configure from

     phy driver that phy driver will can be auto-load when phy driver 
was selected  'M'.


BRs

Yinbo Zhu.