linux-kernel - Re: [spi-devel-general] [PATCH] spi: driver for the Synopsys DesignWare SPI controller

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Message-ID: <63386a3d0905311227v5bb5c278r306e8ae429e77691@mail.gmail.com>
Date:	Sun, 31 May 2009 21:27:56 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	gregkh@...e.de, Baruch Siach <baruch@...s.co.il>
Cc:	spi-devel-general@...ts.sourceforge.net,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [spi-devel-general] [PATCH] spi: driver for the Synopsys 
	DesignWare SPI controller

2009/5/31 Baruch Siach <baruch@...s.co.il>:

>> > +       r = platform_get_resource(dev, IORESOURCE_MEM, 0);
>> > +       if (r == NULL) {
>> > +               ret = -ENODEV;
>>
>> -ENOENT
>
> A quick search in the drivers tree showed no -ENOENT in this situation. Of the
> 10 first results of grep -ENODEV is the most popular as follows:
[The other: 3x -EINVAL one -ENXIO]

Wowsers! And I felt -ENOENT was so intuitive, well if I'm going against
common practice, no good. So let's ask the maintainer of the platform bus
what shall be returned in this situation:

Greg (or some other wise person from linux-kernel) what would you return if
platform_get_resource() returns NULL for an expected resource?

Linus Walleij
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