linux-kernel - Re: [PATCH] net: mv643xx_eth: handle EPROBE

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Message-ID: <91729285-67f9-8fdb-4f97-f0e958cff8dd@ext.kapsi.fi>
Date:   Tue, 22 Feb 2022 07:42:30 +0200
From:   Mauri Sandberg <maukka@....kapsi.fi>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, maukka@....kapsi.fi
Subject: Re: [PATCH] net: mv643xx_eth: handle EPROBE_DEFER


On 22.2.2022 0.15, Andrew Lunn wrote:
>>> Please can you add code to remove the platform device when the probe
>>> fails.
>>
>> I am looking at the vector 'port_platdev' that holds pointers to already
>> initialised ports. There is this mv643xx_eth_shared_of_remove(), which
>> probably could be utilised to remove them. Should I remove the platform
>> devices only in case of probe defer or always if probe fails?
>   
> In general, a failing probe should always undo anything it has done so
> far. Sometimes you can call the release function, or its
> helpers. Other times you do a goto out: and then release stuff in the
> reverse order it was taken.
> 
> It looks like platform_device_del() can take a NULL pointer, so it is
> probably O.K. to call mv643xx_eth_shared_of_remove().

While I am on it, should I call of_node_put() to all port nodes as is
being done to the current child node if probe fails in function
mv643xx_eth_shared_of_probe() [1]?

[1] 
https://elixir.bootlin.com/linux/v5.16/source/drivers/net/ethernet/marvell/mv643xx_eth.c#L2800

-- Mauri