linux-kernel - Re: [PATCH] driver core: platform: Add an error message to platform_get

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Message-ID: <20181222103320.GW26090@n2100.armlinux.org.uk>
Date:   Sat, 22 Dec 2018 10:33:20 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     robh@...nel.org, a.hajda@...sung.com, andy.shevchenko@...il.com,
        b.zolnierkie@...sung.com, broonie@...nel.org,
        gregkh@...uxfoundation.org, javierm@...hat.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        m.szyprowski@...sung.com, rafael@...nel.org
Subject: Re: [PATCH] driver core: platform: Add an error message to
 platform_get_irq*()

On Fri, Dec 21, 2018 at 11:24:52PM -0800, Stephen Boyd wrote:
> A grep of the kernel shows that many drivers print an error message if
> they fail to get the irq they're looking for. Furthermore, those drivers
> all decide to print the device name, or not, and the irq they were
> requesting, or not, etc. Let's consolidate all these error messages into
> the API itself, allowing us to get rid of the error messages in each
> driver.
...
> +error:
> +	if (warn)
> +		dev_err(&dev->dev, "IRQ%d not found\n", num);

Please don't use the notation IRQn - this is normally used when
referring to interrupt numbers (such as those seen in
/proc/interrupts) rather than a per-device interrupt index.
Grep for IRQ% in drivers/ for many examples.

dev_err(&dev->dev, "IRQ index %u not found: %d\n", num, ret);

would be better - note also the use of %u for unsigned integers.
Using %d for them is IMHO sloppy coding.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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