[PATCH 2/2] drm: mcde: Fix forgotten user of drm->dev_private

[Sam Ravnborg]

On Sun, Jun 14, 2020 at 12:30:27AM +0200, Linus Walleij wrote:
> We forgot one call site directly using drm->dev_private.
> This leads to a crash like this:
> 
> 8<--- cut here ---
> Unable to handle kernel NULL pointer dereference at virtual address 00000918
> pgd = (ptrval)
> [00000918] *pgd=00000000
> Internal error: Oops: 5 [#1] SMP ARM
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0-15001-gfa384b50b96b-dirty #514
> Hardware name: ST-Ericsson Ux5x0 platform (Device Tree Support)
> PC is at mcde_display_enable+0x78/0x7c0
> LR is at mcde_display_enable+0x78/0x7c0
> 
> Fix this by using to_mcde() as in other functions.
> 
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Fixes: fd7ee85cfe7b ("drm/mcde: Don't use drm_device->dev_private")
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>

This is the last hit for "git grep dev_private".
Reviewed-by: Sam Ravnborg <sam at ravnborg.org>

> ---
>  drivers/gpu/drm/mcde/mcde_display.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mcde/mcde_display.c b/drivers/gpu/drm/mcde/mcde_display.c
> index b319a474f801..212aee60cf61 100644
> --- a/drivers/gpu/drm/mcde/mcde_display.c
> +++ b/drivers/gpu/drm/mcde/mcde_display.c
> @@ -838,7 +838,7 @@ static void mcde_display_enable(struct drm_simple_display_pipe *pipe,
>  	struct drm_crtc *crtc = &pipe->crtc;
>  	struct drm_plane *plane = &pipe->plane;
>  	struct drm_device *drm = crtc->dev;
> -	struct mcde *mcde = drm->dev_private;
> +	struct mcde *mcde = to_mcde(drm);
>  	const struct drm_display_mode *mode = &cstate->mode;
>  	struct drm_framebuffer *fb = plane->state->fb;
>  	u32 format = fb->format->format;
> -- 
> 2.26.2
> 
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