linux-kernel - Re: [PATCH v2] Revert "fbdev: Make fb_release() return -ENODEV if fbdev was unregistered"

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Date:   Mon, 9 May 2022 16:36:53 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     public@...ruffing.de
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Daniel Vetter <daniel@...ll.ch>, Helge Deller <deller@....de>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Revert "fbdev: Make fb_release() return -ENODEV if
 fbdev was unregistered"

Hello Tim,

On 5/9/22 16:01, public@...ruffing.de wrote:
> Thanks for this patch. Do you think this can be backported to LTS 5.17.y and

You are welcome.

> 5.15.y, which are still buggy? It's not a big deal for me but others might
> profit.
>
> Background:
> The patch solves a regression from 5.17.1 to 5.17.2 or 5.15.32 and
> 5.15.33 I was about to report. On my Thinkpad T570, I got random "BUG", "Oops"
> or even panics when during booting with efifb and plymouthd (and then sometimes
> also problems when shutting down because). I had bisected the issue to commit
> 27599aacbaef. I could provide more info but I don't think it's necessary given
> that either aafa025c76dcc7d1a8c8f0bdefcbe4eb480b2f6a or your better patch now
> fixes the issue (I tested both, both work for me).
>

The patches to fix the fbdev hot-unplug regression will get merged in mainline
soon and since all have a Fixes tag, they should get picked for stable as well.

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat