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 16:01:49 +0200
From:   public@...ruffing.de
To:     Javier Martinez Canillas <javierm@...hat.com>
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, public@...ruffing.de
Subject: Re: [PATCH v2] Revert "fbdev: Make fb_release() return -ENODEV if fbdev was unregistered"

Thanks for this patch. Do you think this can be backported to LTS 5.17.y and
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).

Best,
Tim Ruffing