linux-kernel - Re: [PATCH v2] tty: vt: always invoke vc->vc_sw->con

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Date:   Sat, 15 May 2021 18:32:58 +0200 (CEST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        syzbot <syzbot+1f29e126cf461c4de3b3@...kaller.appspotmail.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Colin King <colin.king@...onical.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jani Nikula <jani.nikula@...el.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        "Antonino A. Daplas" <adaplas@...il.com>
Subject: Re: [PATCH v2] tty: vt: always invoke vc->vc_sw->con_resize
 callback

On Sat, 15 May 2021, Maciej W. Rozycki wrote:

> On Sat, 15 May 2021, Tetsuo Handa wrote:
> 
> > diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> > index 3406067985b1..22bb3892f6bd 100644
> > --- a/drivers/video/fbdev/core/fbcon.c
> > +++ b/drivers/video/fbdev/core/fbcon.c
> > @@ -2019,7 +2019,7 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,
> >  			return -EINVAL;
> >  
> >  		pr_debug("resize now %ix%i\n", var.xres, var.yres);
> > -		if (con_is_visible(vc)) {
> > +		if (con_is_visible(vc) && vc->vc_mode == KD_TEXT) {
> >  			var.activate = FB_ACTIVATE_NOW |
> >  				FB_ACTIVATE_FORCE;
> >  			fb_set_var(info, &var);
> 
>  LGTM, although I'll yet try to verify it with hardware.  But it'll have 
> to wait another week or so as I'm currently away from my lab and this 
> requires physical presence.

 NB I suggest that you request your change to be backported, i.e. post v3 
with:

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@...r.kernel.org # v2.6.12+

  Maciej