linux-kernel - Re: [PATCH v6] media: atomisp: pci: Replace bytes macros with functions

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Date:   Mon, 23 Jan 2023 13:27:53 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Brent Pappas <bpappas@...pasbrent.com>, andy.shevchenko@...il.com
Cc:     ailus@...ux.intel.com, error27@...il.com,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        mchehab@...nel.org
Subject: Re: [PATCH v6] media: atomisp: pci: Replace bytes macros with
 functions

Hi,

On 1/18/23 17:07, Brent Pappas wrote:
> Replace the function-like macros FPNTBL_BYTES(), SCTBL_BYTES(), and
> MORPH_PLANE_BYTES() with functions to comply with Linux coding style
> standards.
> Replace multiplication with calls to array_size() and array3_size()
> to prevent accidental arithmetic overflow.
> 
> Signed-off-by: Brent Pappas <bpappas@...pasbrent.com>

Thank you.

I have added this to my personal git tree now and I will include
this in the atomisp driver pull-req which I will send to the
media-subsystem maintainer in a couple of weeks.

Regards,

Hans




> ---
> Changelog:
> V1 -> V2: Use size_mul() to perform size_t multiplication without risk of
> 		  overflow.
> 		  Remove the inline keyword from function definitions.
> 
> V2 -> V3: Add commit message.
> 
> V3 -> V4: Use array_size() and array3_size() for multiplication.
> 
> V4 -> V5: Fix indentation.
> 
> V5 -> V6: Try again to fix indentation (use tabs of size 8).
> 
>  .../staging/media/atomisp/pci/sh_css_params.c | 38 +++++++++++--------
>  1 file changed, 23 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/staging/media/atomisp/pci/sh_css_params.c b/drivers/staging/media/atomisp/pci/sh_css_params.c
> index f08564f58242..7e111df5c09d 100644
> --- a/drivers/staging/media/atomisp/pci/sh_css_params.c
> +++ b/drivers/staging/media/atomisp/pci/sh_css_params.c
> @@ -98,17 +98,27 @@
>  #include "sh_css_frac.h"
>  #include "ia_css_bufq.h"
>  
> -#define FPNTBL_BYTES(binary) \
> -	(sizeof(char) * (binary)->in_frame_info.res.height * \
> -	 (binary)->in_frame_info.padded_width)
> +static size_t fpntbl_bytes(const struct ia_css_binary *binary)
> +{
> +	return array3_size(sizeof(char),
> +			   binary->in_frame_info.res.height,
> +			   binary->in_frame_info.padded_width);
> +}
>  
> -#define SCTBL_BYTES(binary) \
> -	(sizeof(unsigned short) * (binary)->sctbl_height * \
> -	 (binary)->sctbl_aligned_width_per_color * IA_CSS_SC_NUM_COLORS)
> +static size_t sctbl_bytes(const struct ia_css_binary *binary)
> +{
> +	return size_mul(sizeof(unsigned short),
> +			  array3_size(binary->sctbl_height,
> +				      binary->sctbl_aligned_width_per_color,
> +				      IA_CSS_SC_NUM_COLORS));
> +}
>  
> -#define MORPH_PLANE_BYTES(binary) \
> -	(SH_CSS_MORPH_TABLE_ELEM_BYTES * (binary)->morph_tbl_aligned_width * \
> -	 (binary)->morph_tbl_height)
> +static size_t morph_plane_bytes(const struct ia_css_binary *binary)
> +{
> +	return array3_size(SH_CSS_MORPH_TABLE_ELEM_BYTES,
> +			   binary->morph_tbl_aligned_width,
> +			   binary->morph_tbl_height);
> +}
>  
>  /* We keep a second copy of the ptr struct for the SP to access.
>     Again, this would not be necessary on the chip. */
> @@ -3279,7 +3289,7 @@ sh_css_params_write_to_ddr_internal(
>  	if (binary->info->sp.enable.fpnr) {
>  		buff_realloced = reallocate_buffer(&ddr_map->fpn_tbl,
>  						   &ddr_map_size->fpn_tbl,
> -						   (size_t)(FPNTBL_BYTES(binary)),
> +						   fpntbl_bytes(binary),
>  						   params->config_changed[IA_CSS_FPN_ID],
>  						   &err);
>  		if (err) {
> @@ -3304,7 +3314,7 @@ sh_css_params_write_to_ddr_internal(
>  
>  		buff_realloced = reallocate_buffer(&ddr_map->sc_tbl,
>  						   &ddr_map_size->sc_tbl,
> -						   SCTBL_BYTES(binary),
> +						   sctbl_bytes(binary),
>  						   params->sc_table_changed,
>  						   &err);
>  		if (err) {
> @@ -3538,8 +3548,7 @@ sh_css_params_write_to_ddr_internal(
>  			buff_realloced |=
>  			    reallocate_buffer(virt_addr_tetra_x[i],
>  					    virt_size_tetra_x[i],
> -					    (size_t)
> -					    (MORPH_PLANE_BYTES(binary)),
> +					    morph_plane_bytes(binary),
>  					    params->morph_table_changed,
>  					    &err);
>  			if (err) {
> @@ -3549,8 +3558,7 @@ sh_css_params_write_to_ddr_internal(
>  			buff_realloced |=
>  			    reallocate_buffer(virt_addr_tetra_y[i],
>  					    virt_size_tetra_y[i],
> -					    (size_t)
> -					    (MORPH_PLANE_BYTES(binary)),
> +					    morph_plane_bytes(binary),
>  					    params->morph_table_changed,
>  					    &err);
>  			if (err) {