linux-kernel - Re: [PATCH] net: alacritech: Partially revert "net: alacritech: Switch to use dev_err

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Message-ID: <17dcf3ed-a686-4991-895e-5d684a011d62@linaro.org>
Date: Mon, 2 Sep 2024 18:24:30 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Simon Horman <horms@...nel.org>
Cc: Lino Sanfilippo <LinoSanfilippo@....de>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Jacob Keller <jacob.e.keller@...el.com>, Yang Ruibin <11162571@...o.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: alacritech: Partially revert "net: alacritech:
 Switch to use dev_err_probe()"

On 30/08/2024 20:28, Simon Horman wrote:
> On Fri, Aug 30, 2024 at 07:00:14PM +0200, Krzysztof Kozlowski wrote:
>> This reverts commit bf4d87f884fe8a4b6b61fe4d0e05f293d08df61c because it
>> introduced dev_err_probe() in non-probe path, which is not desired.
>> Calling it after successful probe, dev_err_probe() will set deferred
>> status on the device already probed. See also documentation of
>> dev_err_probe().
> 
> I agree that using dev_err_probe() outside of a probe path is
> inappropriate. And I agree that your patch addresses that problem
> in the context of changes made by the cited commit.
> 
> But, based on my reading of dev_err_probe(), I think the text above is
> slightly misleading. This is because deferred status is only set in the
> case where the err passed to dev_err_probe() is -EPROBE_DEFER. And I do

That's true and indeed request_firmware() will not return EPROBE_DEFER.
I'll update commit msg.

Best regards,
Krzysztof