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From: Wolfram Sang <wsa@the-dreams.de>
To: Stephen Boyd <swboyd@chromium.org>
Cc: Rob Herring <robh@kernel.org>,
	Michal Marek <michal.lkml@markovi.net>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Nicolas Palix <nicolas.palix@imag.fr>,
	linux-kernel@vger.kernel.org,
	Javier Martinez Canillas <javierm@redhat.com>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	Mark Brown <broonie@kernel.org>,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	cocci@systeme.lip6.fr,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [Cocci] [PATCH v5 0/3] Add error message to platform_get_irq*()
Date: Wed, 31 Jul 2019 16:26:46 +0200
Message-ID: <20190731142645.GA1680@kunai> (raw)
In-Reply-To: <20190730053845.126834-1-swboyd@chromium.org>

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Hi Stephen,

> There were some comments about adding an 'optional' platform_get_irq()
> API in v4. This series doesn't include that, but I can add such an API
> if it's required. I started to look into how it might work and got hung
> up on what an optional IRQ means. I suppose it means that in DT there
> isn't an 'interrupts' property in the device node, but in ACPI based
> firmware I'm not sure what that would correspond to. Furthermore, the
> return value is hard to comprehend. Do we return an error when an
> optional irq can't be found? It doesn't seem safe to return 0 because
> sometimes 0 is a valid IRQ. Do other errors in parsing the IRQ
> constitute a failure when the IRQ is optional?

Some time ago, I tried a series like yours and got stuck at this very
point. I found drivers where using an interrupt was optional and
platform_get_irq() returning a failure wasn't fatal. The drivers used
PIO then or dropped some additional functionality. Some of them were
very old.

I didn't like the idea that platform_get_irq() will spit out errors for
those drivers, yet I couldn't create a suitable cocci-script to convert
drivers to use the *_optional callback where possible. So, I neither
created the optional callback.

I still have doubts of unneeded error messages popping up. Has this been
discussed already? (Sorry, I missed the first iterations of this series)

Thanks,

   Wolfram


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Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-30  5:38 Stephen Boyd
2019-07-30  5:38 ` [Cocci] [PATCH v5 3/3] coccinelle: Add script to check for platform_get_irq() excessive prints Stephen Boyd
2019-07-30  8:49   ` Markus Elfring
2019-07-31 14:26 ` Wolfram Sang [this message]
2019-07-31 14:52   ` [Cocci] [PATCH v5 0/3] Add error message to platform_get_irq*() Stephen Boyd
2019-08-01 12:25     ` Wolfram Sang
2019-08-08  7:51       ` Geert Uytterhoeven

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