linux-kernel - Re: [PATCH] fbcon: introduce for_each_registered

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Message-ID: <00590669b886b4cc54548e6101912c3d4d1752f2.camel@petrovitsch.priv.at>
Date:   Mon, 02 Jul 2018 09:36:02 +0200
From:   Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:     Yisheng Xie <ysxie@...mail.com>, b.zolnierkie@...sung.com,
        keescook@...omium.org, j.w.r.degoede@...il.com,
        david@...hnology.com
Cc:     andriy.shevchenko@...ux.intel.com, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fbcon: introduce for_each_registered_fb() helper

Hi all!

On Fri, 2018-06-29 at 00:20 +0800, Yisheng Xie wrote:
[...]
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index aa74a22..3e13b95 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -650,6 +650,10 @@ extern int fb_get_color_depth(struct
> fb_var_screeninfo *var,
>  extern int num_registered_fb;
>  extern struct class *fb_class;
>  
> +#define for_each_registered_fb(i)		\
> +	for (i = 0; i < FB_MAX; i++)		\
> +		if (registered_fb[i])
> +

That leaves the possibility of a dangling-else.
----  snip  ----
#define for_each_registered_fb(i)		\
	for (i = 0; i < FB_MAX; i++)		\
		if (!registered_fb[i])		\
			continue;		\
		else
----  snip  ----
avoids that.

Kind regards,
	Bernd
-- 
Bernd Petrovitsch                  Email : bernd@...rovitsch.priv.at
                     LUGA : http://www.luga.at