netdev - Re: [PATCH 1/2] platform: make platform_get_irq

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Message-ID: <20220119113314.tpqfdgi6nurmzfun@pengutronix.de>
Date:   Wed, 19 Jan 2022 12:33:14 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Sergey Shtylyov <s.shtylyov@....ru>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Lunn <andrew@...n.ch>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Vignesh Raghavendra <vigneshr@...com>, kvm@...r.kernel.org,
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        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/2] platform: make platform_get_irq_optional() optional
 (summary)

Hello Sergey,

On Wed, Jan 19, 2022 at 01:56:12PM +0300, Sergey Shtylyov wrote:
> On 1/18/22 12:18 PM, Uwe Kleine-König wrote:
> > On Sun, Jan 16, 2022 at 03:19:06PM +0100, Greg Kroah-Hartman wrote:
> >> On Sat, Jan 15, 2022 at 07:36:43PM +0100, Uwe Kleine-König wrote:
> >>> A possible compromise: We can have both. We rename
> >>> platform_get_irq_optional() to platform_get_irq_silent() (or
> >>> platform_get_irq_silently() if this is preferred) and once all users are
> >>> are changed (which can be done mechanically), we reintroduce a
> >>> platform_get_irq_optional() with Sergey's suggested semantic (i.e.
> >>> return 0 on not-found, no error message printking).
> >>
> >> Please do not do that as anyone trying to forward-port an old driver
> >> will miss the abi change of functionality and get confused.  Make
> >> build-breaking changes, if the way a function currently works is
> >> changed in order to give people a chance.
> > 
> > Fine for me. I assume this is a Nack for Sergey's patch?
> 
>    Which patch do you mean? I'm starting to get really muddled... :-(

I'm talking about "[PATCH 1/2] platform: make
platform_get_irq_optional() optional" because "trying to forward-port an
old driver will miss the abi" applies to it.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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