linux-kernel - Re: [PATCH 1/3] gpio: mockup: fix indicated direction

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Date:   Fri, 9 Nov 2018 12:13:44 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Bamvor Jian Zhang <bamv2005@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] gpio: mockup: fix indicated direction

czw., 8 lis 2018 o 21:35 Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> napisał(a):
>
> Hello Bartosz,
>
> On Thu, Nov 08, 2018 at 05:52:53PM +0100, Bartosz Golaszewski wrote:
> > Commit 3edfb7bd76bd ("gpiolib: Show correct direction from the
> > beginning") fixed an existing issue but broke libgpiod tests by
> > changing the default direction of dummy lines to output.
>
> The indicated commit only changed what was shown in debugfs, but didn't
> touch the actual direction of a GPIO, doesn't it? If someone called
> gpiod_get_direction before it would have returned "output", too, unless
> I miss something.
>

This commit (3edfb7bd76bd) sets the correct direction of the line by
actually calling get_direction() instead of assuming input if
direction_input is not NULL. It just so happened that previously the
default direction of gpio-mockup lines was output but it would be
displayed as input due to this inconsistency.

My commit fixes it by simply setting the value of GPIO_MOCKUP_DIR_IN
to 0 so that when we kzalloc the line structure, we'll get the right
direction automatically.

Bart