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

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Message-ID: <20240830182844.GE1368797@kernel.org>
Date: Fri, 30 Aug 2024 19:28:44 +0100
From: Simon Horman <horms@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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 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
suspect that is never the case for the calls removed by this patch.

> Fixes: bf4d87f884fe ("net: alacritech: Switch to use dev_err_probe()")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

...