linux-kernel - Re: [PATCH v8 3/3] media: rcar-csi2: Optimize the selection PHTW register

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 1 Jul 2020 00:08:16 +0200
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Suresh Udipi <sudipi@...adit-jv.com>
Cc:     mrodin@...adit-jv.com, akiyama@...-osk.co.jp,
        efriedrich@...adit-jv.com, erosca@...adit-jv.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, mchehab@...nel.org,
        michael@...in.online, securitycheck@...so.co.jp
Subject: Re: [PATCH v8 3/3] media: rcar-csi2: Optimize the selection PHTW
 register

Hi Suresh,

Thanks for your work.

On 2020-06-18 19:34:32 +0900, Suresh Udipi wrote:
> PHTW register is selected based on default bit rate from Table[1].
> for the bit rates less than or equal to 250. Currently first
> value of default bit rate which is greater than or equal to
> the caculated mbps is selected.This selection can be further

Missing space 'selected.This'.

> improved by selecting the default bit rate which is nearest to
> the calculated value.
> 
> [1] specs r19uh0105ej0200-r-car-3rd-generation.pdf [Table 25.12]
> 
> Fixes: 769afd212b16 ("media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver")

Nit-pick: No need for a blank line between fixes and SoB.

> 
> Signed-off-by: Suresh Udipi <sudipi@...adit-jv.com>
> Signed-off-by: Michael Rodin <mrodin@...adit-jv.com>
> ---
>  drivers/media/platform/rcar-vin/rcar-csi2.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
> index 1184527..d7bf59f 100644
> --- a/drivers/media/platform/rcar-vin/rcar-csi2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
> @@ -917,10 +917,18 @@ static int rcsi2_phtw_write_mbps(struct rcar_csi2 *priv, unsigned int mbps,
>  				 const struct rcsi2_mbps_reg *values, u16 code)
>  {
>  	const struct rcsi2_mbps_reg *value;
> +	const struct rcsi2_mbps_reg *prev_value = NULL;
>  
> -	for (value = values; value->mbps; value++)
> +	for (value = values; value->mbps; value++) {
>  		if (value->mbps >= mbps)
>  			break;
> +		prev_value = value;
> +	}
> +
> +	if (prev_value &&
> +	    ((mbps - prev_value->mbps) <= (value->mbps - mbps)))
> +		value = prev_value;
> +

One to many blank lines. With this and the commit message fixed,

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Nice work, thanks again for being persistent with this!

>  
>  	if (!value->mbps) {
>  		dev_err(priv->dev, "Unsupported PHY speed (%u Mbps)", mbps);
> -- 
> 2.7.4
> 

-- 
Regards,
Niklas Söderlund