linux-kernel - Re: [PATCH WIP 1/6] media: vidtv: extract the initial CRC value to into a #define

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Message-ID: <20200929071918.15c018ac@coco.lan>
Date:   Tue, 29 Sep 2020 07:19:18 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     "Daniel W. S. Almeida" <dwlsalmeida@...il.com>
Cc:     r.verdejo@...sung.com, nicolas@...fresne.ca,
        linux-media@...r.kernel.org, skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH WIP 1/6] media: vidtv: extract the initial CRC value to
 into a #define

Em Tue, 29 Sep 2020 00:26:20 -0300
"Daniel W. S. Almeida" <dwlsalmeida@...il.com> escreveu:

> From: Daniel W. S. Almeida <dwlsalmeida@...il.com>

On a very quick look, patches seem good. Why did you mark them as WIP?

Next time, please add a patch 0, specially when you tag something as
WIP, or RFC.

> 
> The same constant (0xffffffff) is used in three different functions.

This one at least seems to be ready for merging ;-)

Regards,
Mauro
> 
> Extract it into a #define to avoid repetition.
> 
> Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@...il.com>
> ---
>  drivers/media/test-drivers/vidtv/vidtv_psi.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/test-drivers/vidtv/vidtv_psi.c b/drivers/media/test-drivers/vidtv/vidtv_psi.c
> index 3151b300a91b..a24e84adc8ce 100644
> --- a/drivers/media/test-drivers/vidtv/vidtv_psi.c
> +++ b/drivers/media/test-drivers/vidtv/vidtv_psi.c
> @@ -30,6 +30,7 @@
>  
>  #define CRC_SIZE_IN_BYTES 4
>  #define MAX_VERSION_NUM 32
> +#define INITIAL_CRC 0xffffffff
>  
>  static const u32 CRC_LUT[256] = {
>  	/* from libdvbv5 */
> @@ -794,7 +795,7 @@ u32 vidtv_psi_pat_write_into(struct vidtv_psi_pat_write_args args)
>  	/* the number of bytes written by this function */
>  	u32 nbytes = 0;
>  	const u16 pat_pid = VIDTV_PAT_PID;
> -	u32 crc = 0xffffffff;
> +	u32 crc = INITIAL_CRC;
>  
>  	struct vidtv_psi_table_pat_program *p = args.pat->program;
>  
> @@ -990,7 +991,7 @@ u32 vidtv_psi_pmt_write_into(struct vidtv_psi_pmt_write_args args)
>  {
>  	/* the number of bytes written by this function */
>  	u32 nbytes = 0;
> -	u32 crc = 0xffffffff;
> +	u32 crc = INITIAL_CRC;
>  
>  	struct vidtv_psi_desc *table_descriptor   = args.pmt->descriptor;
>  	struct vidtv_psi_table_pmt_stream *stream = args.pmt->stream;
> @@ -1143,7 +1144,7 @@ u32 vidtv_psi_sdt_write_into(struct vidtv_psi_sdt_write_args args)
>  	u32 nbytes  = 0;
>  	u16 sdt_pid = VIDTV_SDT_PID;  /* see ETSI EN 300 468 v1.15.1 p. 11 */
>  
> -	u32 crc = 0xffffffff;
> +	u32 crc = INITIAL_CRC;
>  
>  	struct vidtv_psi_table_sdt_service *service = args.sdt->service;
>  	struct vidtv_psi_desc *service_desc = (args.sdt->service) ?



Thanks,
Mauro