Re: omapdrm regression in v4.17-rc series

[Benoit Parrot]

Reviewed-by: Benoit Parrot <bparrot@xxxxxx>

Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote on Thu [2018-May-24 10:58:25 +0300]:
> 
> On 24/05/18 01:03, Tony Lindgren wrote:
> > Hi all,
> > 
> > I bisected the n900 LCD issue to commit 24aac6011f70 ("drm: omapdrm:
> > sdi: Allocate the sdi private data structure dynamically"). Reverting
> > this patch makes LCD work for me again on n900.
> > 
> > Any ideas?
> 
> This should help to get the SDI enabled.
> 
>  Tomi
> 
> From 4e96e6c2dedf366e081331c3825ff6fa8aabd85c Mon Sep 17 00:00:00 2001
> From: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
> Date: Thu, 24 May 2018 10:53:24 +0300
> Subject: [PATCH] drm/omap: fix NULL deref crash with SDI displays
> 
> Fix a NULL deref bug introduced in commit 24aac6011f70 ("drm: omapdrm:
> sdi: Allocate the sdi private data structure dynamically").
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
> ---
>  drivers/gpu/drm/omapdrm/dss/sdi.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/dss/sdi.c b/drivers/gpu/drm/omapdrm/dss/sdi.c
> index 68a40ae26f5b..1e2c931f6acf 100644
> --- a/drivers/gpu/drm/omapdrm/dss/sdi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/sdi.c
> @@ -82,7 +82,7 @@ static int sdi_calc_clock_div(struct sdi_device *sdi, unsigned long pclk,
>  			      struct dispc_clock_info *dispc_cinfo)
>  {
>  	int i;
> -	struct sdi_clk_calc_ctx ctx = { .sdi = sdi };
> +	struct sdi_clk_calc_ctx ctx;
>  
>  	/*
>  	 * DSS fclk gives us very few possibilities, so finding a good pixel
> @@ -95,6 +95,9 @@ static int sdi_calc_clock_div(struct sdi_device *sdi, unsigned long pclk,
>  		bool ok;
>  
>  		memset(&ctx, 0, sizeof(ctx));
> +
> +		ctx.sdi = sdi;
> +
>  		if (pclk > 1000 * i * i * i)
>  			ctx.pck_min = max(pclk - 1000 * i * i * i, 0lu);
>  		else
> 
> -- 
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