linux-kernel - Re: [PATCH v2] drm/vblank: Fix for drivers that do not drm_vblank

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Message-ID: <CAMuHMdUph5ADYcC0EnEEMDjTLC5TQrTzRXmTDOOOZ0SAjxPV0Q@mail.gmail.com>
Date:   Tue, 4 Apr 2023 15:37:22 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>,
        Javier Martinez Canillas <javierm@...hat.com>
Subject: Re: [PATCH v2] drm/vblank: Fix for drivers that do not drm_vblank_init()

On Mon, Apr 3, 2023 at 6:07 PM Rob Clark <robdclark@...il.com> wrote:
> From: Rob Clark <robdclark@...omium.org>
>
> This should fix a crash that was reported on ast (and possibly other
> drivers which do not initialize vblank).
>
>    fbcon: Taking over console
>    Unable to handle kernel NULL pointer dereference at virtual address 0000000000000074

Thanks, this fixes a crash seen with the ssd130x DRM driver.
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds