linux-kernel - Re: [PATCH] drm/sun4i: dsi: Avoid hotplug race with DRM driver bind

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Message-ID: <20200219155754.vajepubw64hxfmum@gilmour.lan>
Date:   Wed, 19 Feb 2020 16:57:54 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] drm/sun4i: dsi: Avoid hotplug race with DRM driver bind

On Mon, Feb 17, 2020 at 12:09:06AM -0600, Samuel Holland wrote:
> We need to make sure that the DRM driver is fully registered before
> allowing the panel to be attached. Otherwise, we may trigger a hotplug
> event before sun4i_framebuffer_init() sets up drm->mode_config.funcs,
> causing a NULL pointer dereference.
>
> Fixes: 1a2703bd7356 ("drm/sun4i: dsi: Allow binding the host without a panel")
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Thanks for following up on this, I've applied it

Maxime

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