netdev - Re: [PATCH v7 24/30] net: wan: Add framer framework support

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Date: Tue, 10 Oct 2023 09:57:33 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Andrew Lunn
 <andrew@...n.ch>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Linus Walleij <linus.walleij@...aro.org>, Qiang Zhao <qiang.zhao@....com>,
 Li Yang <leoyang.li@....com>, Liam Girdwood <lgirdwood@...il.com>, Mark
 Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai
 <tiwai@...e.com>, Shengjiu Wang <shengjiu.wang@...il.com>, Xiubo Li
 <Xiubo.Lee@...il.com>, Fabio Estevam <festevam@...il.com>, Nicolin Chen
 <nicoleotsuka@...il.com>, Christophe Leroy <christophe.leroy@...roup.eu>,
 Randy Dunlap <rdunlap@...radead.org>, netdev@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org, Simon
 Horman <horms@...nel.org>, Christophe JAILLET
 <christophe.jaillet@...adoo.fr>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v7 24/30] net: wan: Add framer framework support

Hi Jakub

On Fri, 6 Oct 2023 15:08:10 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Thu, 28 Sep 2023 09:06:42 +0200 Herve Codina wrote:
> > +menu "Framer Subsystem"
> > +
> > +config GENERIC_FRAMER
> > +	bool "Framer Core"
> > +	help
> > +	  Generic Framer support.
> > +	  A framer is a component in charge of an E1/T1 line interface.
> > +	  Connected usually to a TDM bus, it converts TDM frames to/from E1/T1
> > +	  frames. It also provides information related to the E1/T1 line.
> > +	  Used with HDLC, the network can be reached through the E1/T1 line.
> > +
> > +	  This framework is designed to provide a generic interface for framer
> > +	  devices present in the kernel. This layer will have the generic
> > +	  API by which framer drivers can create framer using the framer
> > +	  framework and framer users can obtain reference to the framer.
> > +	  All the users of this framework should select this config.  
> 
> maybe make the menu a menuconfig with info about framers but hide 
> the GENERIC_FRAMER symbol? The driver 'select' it anyway, what's
> the point of prompting the user..

Yes, I will change in the next iteration.

> 
> > +	if (WARN_ON(!dev))
> > +		return ERR_PTR(-EINVAL);  
> 
> no defensive programming, let the kernel crash

Will be changed.

> 
> > +	ret = framer_pm_runtime_get_sync(framer);
> > +	if (ret < 0 && ret != -EOPNOTSUPP)
> > +		goto err_pm_sync;
> > +
> > +	ret = 0; /* Override possible ret == -EOPNOTSUPP */  
> 
> This looks pointless given that ret is either overwritten or not used
> later on

Indeed. Will be removed in the next iteration.

> 
> > +	mutex_lock(&framer->mutex);
> > +	if (framer->power_count == 0 && framer->ops->power_on) {
> > +		ret = framer->ops->power_on(framer);
> > +		if (ret < 0) {
> > +			dev_err(&framer->dev, "framer poweron failed --> %d\n", ret);
> > +			goto err_pwr_on;
> > +		}
> > +	}
> > +	++framer->power_count;
> > +	mutex_unlock(&framer->mutex);
> > +	return 0;  

Best regards,
Hervé