linux-kernel - Re: [PATCH v4 1/3] driver core: add probe

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Date:   Thu, 20 Dec 2018 12:14:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andrzej Hajda <a.hajda@...sung.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org,
        Javier Martinez Canillas <javierm@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, andy.shevchenko@...il.com,
        Mark Brown <broonie@...nel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>
Subject: Re: [PATCH v4 1/3] driver core: add probe_err log helper

On Thu, Dec 20, 2018 at 11:22:45AM +0100, Andrzej Hajda wrote:
> During probe every time driver gets resource it should usually check for error
> printk some message if it is not -EPROBE_DEFER and return the error. This
> pattern is simple but requires adding few lines after any resource acquisition
> code, as a result it is often omited or implemented only partially.
> probe_err helps to replace such code sequences with simple call, so code:
> 	if (err != -EPROBE_DEFER)
> 		dev_err(dev, ...);
> 	return err;
> becomes:
> 	return probe_err(dev, err, ...);

Can you show a driver being converted to use this to show if it really
will save a bunch of lines and make things simpler?  Usually you are
requesting lots of resources so you need to do more than just return,
you need to clean stuff up first.

thanks,

greg k-h