linux-kernel - Re: [patch/rfc 1/4] GPIO implementation framework

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Message-Id: <200711271129.46754.david-b@pacbell.net>
Date:	Tue, 27 Nov 2007 11:29:46 -0800
From:	David Brownell <david-b@...bell.net>
To:	"eric miao" <eric.y.miao@...il.com>
Cc:	"Linux Kernel list" <linux-kernel@...r.kernel.org>,
	"Felipe Balbi" <felipebalbi@...rs.sourceforge.net>,
	"Bill Gatliff" <bgat@...lgatliff.com>,
	"Haavard Skinnemoen" <hskinnemoen@...el.com>,
	"Andrew Victor" <andrew@...people.com>,
	"Tony Lindgren" <tony@...mide.com>,
	"Jean Delvare" <khali@...ux-fr.org>,
	"Kevin Hilman" <khilman@...sta.com>,
	"Paul Mundt" <lethal@...ux-sh.org>,
	"Ben Dooks" <ben@...nity.fluff.org>
Subject: Re: [patch/rfc 1/4] GPIO implementation framework

On Tuesday 27 November 2007, eric miao wrote:
>         status = chip->direction_input(chip, gpio);
> -       if (status == 0)
> -               clear_bit(gpio, chip->is_out);
> +       if (status)
> +               desc->is_out = 0;

You added that same bug in two places (direction_output too).
Only zero status means success; otherwise it's negative errno.

Clearly this patch wasn't tested at all.
-
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