linux-kernel - Re: [PATCH v4 1/5] net: wan: Add support for QMC HDLC

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Message-ID: <20240222184505.7350df2e@bootlin.com>
Date: Thu, 22 Feb 2024 18:45:05 +0100
From: Herve Codina <herve.codina@...tlin.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Vadim Fedorenko <vadim.fedorenko@...ux.dev>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Yury Norov
 <yury.norov@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, Andrew Lunn <andrew@...n.ch>, Mark Brown
 <broonie@...nel.org>, Christophe Leroy <christophe.leroy@...roup.eu>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v4 1/5] net: wan: Add support for QMC HDLC

Andy, Jakub,

On Thu, 22 Feb 2024 18:56:26 +0200
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> On Thu, Feb 22, 2024 at 05:45:01PM +0100, Herve Codina wrote:
> > On Thu, 22 Feb 2024 17:29:05 +0200
> > Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:  
> > > On Thu, Feb 22, 2024 at 03:22:14PM +0100, Herve Codina wrote:  
> 
> ...
> 
> > > > +	spin_lock_irqsave(&qmc_hdlc->tx_lock, flags);    
> > > 
> > > Why not using cleanup.h from day 1?  
> > 
> > I don't know about cleanup.h.
> > Can you tell me more ?
> > How should I use it ?
> >   
> > > > +end:    
> > > 
> > > This label, in particular, will not be needed with above in place.
> > >   
> > > > +	spin_unlock_irqrestore(&qmc_hdlc->tx_lock, flags);
> > > > +	return ret;
> > > > +}    
> 
> Here are the examples:
> 6191e49de389 ("pinctrl: baytrail: Simplify code with cleanup helpers")
> 1d1b4770d4b6 ("platform/x86/intel/vsec: Use cleanup.h")
> e2eeddefb046 ("pstore: inode: Convert mutex usage to guard(mutex)")
> 
> Some advanced stuff:
> ced085ef369a ("PCI: Introduce cleanup helpers for device reference counts and locks")
> 
> Hope this helps.

Sure, thanks for the pointer.

Jakub,
nothing in drivers/net seems to use the guard() (from cleanup.h) family
macro.
Are you ok with having this HDLC driver that uses guard() macros ?

Best regards,
Hervé

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com