linux-kernel - Re: [PATCH] drm/amd/display: fix type mismatch in CalculateDynamicMetadataParameters()

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Message-ID: <58f33eb8-ae56-416a-ab23-2690160756cd@amd.com>
Date: Tue, 25 Feb 2025 17:19:37 -0700
From: Alex Hung <alex.hung@....com>
To: Vitaliy Shevtsov <v.shevtsov@...integration.ru>,
 Chaitanya Dhere <chaitanya.dhere@....com>
Cc: Jun Lei <jun.lei@....com>, Harry Wentland <harry.wentland@....com>,
 Leo Li <sunpeng.li@....com>, Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
 Alex Deucher <alexander.deucher@....com>,
 Christian König <christian.koenig@....com>,
 Xinhui Pan <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Fangzhi Zuo <jerry.zuo@....com>,
 Aric Cyr <aric.cyr@....com>, amd-gfx@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 lvc-project@...uxtesting.org
Subject: Re: [PATCH] drm/amd/display: fix type mismatch in
 CalculateDynamicMetadataParameters()



On 2/22/25 16:58, Vitaliy Shevtsov wrote:
> There is a type mismatch between what CalculateDynamicMetadataParameters()
> takes and what is passed to it. Currently this function accepts several
> args as signed long but it's called with unsigned integers. On some systems
> where long is 32 bits and one of these input params is greater than INT_MAX
> it may cause passing input params as negative values.
> 
> Fix this by changing these argument types from long to unsigned int. Also
> this will align the function's definition with similar functions in other
> dcn* drivers.
> 
> Found by Linux Verification Center (linuxtesting.org) with Svace.
> 
> Signed-off-by: Vitaliy Shevtsov <v.shevtsov@...integration.ru>
> ---
>   .../amd/display/dc/dml/dcn30/display_mode_vba_30.c   | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c b/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
> index cee1b351e105..c6c7ce84e260 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
> @@ -281,10 +281,10 @@ static void CalculateDynamicMetadataParameters(
>   		double DISPCLK,
>   		double DCFClkDeepSleep,
>   		double PixelClock,
> -		long HTotal,
> -		long VBlank,
> -		long DynamicMetadataTransmittedBytes,
> -		long DynamicMetadataLinesBeforeActiveRequired,
> +		unsigned int HTotal,
> +		unsigned int VBlank,
> +		unsigned int DynamicMetadataTransmittedBytes,
> +		unsigned int DynamicMetadataLinesBeforeActiveRequired,

DynamicMetadataLinesBeforeActiveRequired past to 
"CalculateDynamicMetadataParameters" are int instead of unsigned int. 
Can you confirm and try with Svace?

Thanks.


>   		int InterlaceEnable,
>   		bool ProgressiveToInterlaceUnitInOPP,
>   		double *Tsetup,
> @@ -3265,8 +3265,8 @@ static double CalculateWriteBackDelay(
>   
>   
>   static void CalculateDynamicMetadataParameters(int MaxInterDCNTileRepeaters, double DPPCLK, double DISPCLK,
> -		double DCFClkDeepSleep, double PixelClock, long HTotal, long VBlank, long DynamicMetadataTransmittedBytes,
> -		long DynamicMetadataLinesBeforeActiveRequired, int InterlaceEnable, bool ProgressiveToInterlaceUnitInOPP,
> +		double DCFClkDeepSleep, double PixelClock, unsigned int HTotal, unsigned int VBlank, unsigned int DynamicMetadataTransmittedBytes,
> +		unsigned int DynamicMetadataLinesBeforeActiveRequired, int InterlaceEnable, bool ProgressiveToInterlaceUnitInOPP,
>   		double *Tsetup, double *Tdmbf, double *Tdmec, double *Tdmsks)
>   {
>   	double TotalRepeaterDelayTime = 0;