linux-kernel - Re: [PATCH v8 1/2] pwm: meson: Add support for Amlogic S4 PWM

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Date: Mon, 17 Jun 2024 16:11:54 +0200
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Junyi Zhao <junyi.zhao@...ogic.com>
Cc: Jerome Brunet <jbrunet@...libre.com>, 
	Kelvin Zhang via B4 Relay <devnull+kelvin.zhang.amlogic.com@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Kevin Hilman <khilman@...libre.com>, Martin Blumenstingl <martin.blumenstingl@...glemail.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, kelvin.zhang@...ogic.com, linux-pwm@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH v8 1/2] pwm: meson: Add support for Amlogic S4 PWM

Hello,

On Mon, Jun 17, 2024 at 04:44:13PM +0800, Junyi Zhao wrote:
> > > So yes, please use dev_err_probe() also to handle
> > > devm_add_action_or_reset().
> > 
> > My point here is also that devm_add_action_or_reset() can only fail on
> > memory allocation, like (devm_)kzalloc. Looking around the kernel, we
> > tend to not add messages for that and just return the error code,
> > presumably because those same 'out of memory' messages would proliferate
> > everywhere.
>
> Hi Uwe, I didnt get the clear point.
> So, if we need "return ret" directly? or keep "dev_err_probe()" to print?

Please keep the dev_err_probe(). There is a problem with that approach
(as Jerome pointed out), but that is about to be addressed in driver
core code.

Best regards
Uwe

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