linux-kernel - Re: [PATCH v2] leds: Introduce userspace leds driver

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Message-id: <69e2865f-8ba9-ea1a-594f-3de4131e3ea2@samsung.com>
Date:   Thu, 15 Sep 2016 16:54:09 +0200
From:   Jacek Anaszewski <j.anaszewski@...sung.com>
To:     Pavel Machek <pavel@....cz>
Cc:     David Lechner <david@...hnology.com>,
        Richard Purdie <rpurdie@...ys.net>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [PATCH v2] leds: Introduce userspace leds driver

Hi Pavel,

On 09/15/2016 03:01 PM, Pavel Machek wrote:
> Hi!
>
>>> @@ -0,0 +1,23 @@
>>> +/*
>>> + * Userspace driver support for leds subsystem
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License as published by
>>> + * the Free Software Foundation; either version 2 of the License, or
>>> + * (at your option) any later version.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + */
>>> +#ifndef _UAPI__ULEDS_H_
>>> +#define _UAPI__ULEDS_H_
>>> +
>>> +#define ULEDS_MAX_NAME_SIZE	80
>>> +
>>> +struct uleds_user_dev {
>>> +	char name[ULEDS_MAX_NAME_SIZE];
>>> +};
>
> We already have path component length limit somewhere, right? Just use
> it?
>
> (And is struct with char array good idea at all? Perphaps it can just
> use write() length up to something reasonable, and not bother with new
> header file for userspace?)

In fact in this case the addition of another public header can be
avoided.

-- 
Best regards,
Jacek Anaszewski