netdev - Re: [PATCH] driver core: platform: Rename platform_get_irq_optional() to platform_get_irq

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Date:   Fri, 14 Jan 2022 15:04:38 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Mark Brown <broonie@...nel.org>, Andrew Lunn <andrew@...n.ch>,
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Subject: Re: [PATCH] driver core: platform: Rename
 platform_get_irq_optional() to platform_get_irq_silent()

On Thu, Jan 13, 2022 at 08:43:58PM +0100, Uwe Kleine-König wrote:
> The subsystems regulator, clk and gpio have the concept of a dummy
> resource. For regulator, clk and gpio there is a semantic difference
> between the regular _get() function and the _get_optional() variant.
> (One might return the dummy resource, the other won't. Unfortunately
> which one implements which isn't the same for these three.) The
> difference between platform_get_irq() and platform_get_irq_optional() is
> only that the former might emit an error message and the later won't.
> 
> To prevent people's expectations that there is a semantic difference
> between these too, rename platform_get_irq_optional() to
> platform_get_irq_silent() to make the actual difference more obvious.
> 
> The #define for the old name can and should be removed once all patches
> currently in flux still relying on platform_get_irq_optional() are
> fixed.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ---
> Hello,
> 
> On Thu, Jan 13, 2022 at 02:45:30PM +0000, Mark Brown wrote:
> > On Thu, Jan 13, 2022 at 12:08:31PM +0100, Uwe Kleine-König wrote:
> > 
> > > This is all very unfortunate. In my eyes b) is the most sensible
> > > sense, but the past showed that we don't agree here. (The most annoying
> > > part of regulator_get is the warning that is emitted that regularily
> > > makes customers ask what happens here and if this is fixable.)
> > 
> > Fortunately it can be fixed, and it's safer to clearly specify things.
> > The prints are there because when the description is wrong enough to
> > cause things to blow up we can fail to boot or run messily and
> > forgetting to describe some supplies (or typoing so they haven't done
> > that) and people were having a hard time figuring out what might've
> > happened.
> 
> Yes, that's right. I sent a patch for such a warning in 2019 and pinged
> occationally. Still waiting for it to be merged :-\
> (https://lore.kernel.org/r/20190625100412.11815-1-u.kleine-koenig@pengutronix.de)
> 
> > > I think at least c) is easy to resolve because
> > > platform_get_irq_optional() isn't that old yet and mechanically
> > > replacing it by platform_get_irq_silent() should be easy and safe.
> > > And this is orthogonal to the discussion if -ENOXIO is a sensible return
> > > value and if it's as easy as it could be to work with errors on irq
> > > lookups.
> > 
> > It'd certainly be good to name anything that doesn't correspond to one
> > of the existing semantics for the API (!) something different rather
> > than adding yet another potentially overloaded meaning.
> 
> It seems we're (at least) three who agree about this. Here is a patch
> fixing the name.


And similar number of people are on the other side.

-- 
With Best Regards,
Andy Shevchenko