linux-kernel - Re: [PATCH v2 1/2] media: renesas: rzg2l-cru: Simplify FIFO empty check

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Message-ID: <aBHpR18KE2l6VJsC@tom-desktop>
Date: Wed, 30 Apr 2025 11:11:35 +0200
From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH v2 1/2] media: renesas: rzg2l-cru: Simplify FIFO empty
 check

On Tue, Apr 29, 2025 at 10:16:08AM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Collapse FIFO empty helper into a single return statement by removing the
> redundant `if (amnfifopntr_w == amnfifopntr_r_y) return true;` path. Make
> `rzg2l_fifo_empty()` directly return `amnfifopntr_w == amnfifopntr_r_y`
> to improve readability without changing behavior.
> 
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/all/aAtQThCibZCROETx@stanley.mountain/
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Reviewed-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
Tested-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>

Thanks & Regards,
Tommaso

> ---
>  drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
> index 067c6af14e95..3d0810b3c35e 100644
> --- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
> @@ -345,8 +345,6 @@ bool rzg2l_fifo_empty(struct rzg2l_cru_dev *cru)
>  	amnfifopntr_w = amnfifopntr & AMnFIFOPNTR_FIFOWPNTR;
>  	amnfifopntr_r_y =
>  		(amnfifopntr & AMnFIFOPNTR_FIFORPNTR_Y) >> 16;
> -	if (amnfifopntr_w == amnfifopntr_r_y)
> -		return true;
>  
>  	return amnfifopntr_w == amnfifopntr_r_y;
>  }
> -- 
> 2.49.0
> 
>