linux-kernel - Re: [PATCH 06/21] fbcon: delete delayed loading code

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Date:   Thu, 3 Feb 2022 21:45:29 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        linux-fbdev@...r.kernel.org, Du Cheng <ducheng2@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Claudio Suarez <cssk@...-c.es>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Helge Deller <deller@....de>
Subject: Re: [PATCH 06/21] fbcon: delete delayed loading code

Hi Daniel,

On Mon, Jan 31, 2022 at 10:05:37PM +0100, Daniel Vetter wrote:
> Before
> 
> commit 6104c37094e729f3d4ce65797002112735d49cd1
> Author: Daniel Vetter <daniel.vetter@...ll.ch>
> Date:   Tue Aug 1 17:32:07 2017 +0200
> 
>     fbcon: Make fbcon a built-time depency for fbdev
> 
> it was possible to load fbcon and fbdev drivers in any order, which
> means that fbcon init had to handle the case where fbdev drivers where
> already registered.
> 
> This is no longer possible, hence delete that code.
> 
> Note that the exit case is a bit more complex and will be done in a
> separate patch.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Helge Deller <deller@....de>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Claudio Suarez <cssk@...-c.es>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Cc: Du Cheng <ducheng2@...il.com>
> ---
>  drivers/video/fbdev/core/fbcon.c | 13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
> 
> diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> index 8f971de35885..814b648e8f09 100644
> --- a/drivers/video/fbdev/core/fbcon.c
> +++ b/drivers/video/fbdev/core/fbcon.c
> @@ -942,7 +942,7 @@ static const char *fbcon_startup(void)
>  		return display_desc;
>  	/*
>  	 * Instead of blindly using registered_fb[0], we use info_idx, set by
> -	 * fb_console_init();
> +	 * fbcon_fb_registered();
>  	 */
This comment change looks like it does not belong in this patch.
Also, the comment is wrong as info_idx is set in several places.
Like set_con2fb_map(), fbcon_remap_all(), and more.

Though it is not set by fb_console_init - so partly OK.

With the comment adjustment dropped.
Acked-by: Sam Ravnborg <sam@...nborg.org>

at least the code deletion looked OK, I failed to follow all the logic.
So would be good if someone else could ack it too.

	Sam



>  	info = registered_fb[info_idx];
>  	if (!info)
> @@ -3316,17 +3316,6 @@ static void fbcon_start(void)
>  		return;
>  	}
>  #endif
> -
> -	if (num_registered_fb) {
> -		int i;
> -
> -		for_each_registered_fb(i) {
> -			info_idx = i;
> -			break;
> -		}
> -
> -		do_fbcon_takeover(0);
> -	}
>  }
>  
>  static void fbcon_exit(void)
> -- 
> 2.33.0