linux-kernel - Re: [PATCH 1/4] dmaengine: axi-dmac: Small code cleanup

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Date:   Mon, 11 Dec 2023 17:27:22 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Nuno Sá <noname.nuno@...il.com>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dmaengine: axi-dmac: Small code cleanup

On 04-12-23, 15:03, Paul Cercueil wrote:
> Use a for() loop instead of a while() loop in axi_dmac_fill_linear_sg().

Why?

> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  drivers/dma/dma-axi-dmac.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
> index 2457a420c13d..760940b21eab 100644
> --- a/drivers/dma/dma-axi-dmac.c
> +++ b/drivers/dma/dma-axi-dmac.c
> @@ -508,16 +508,13 @@ static struct axi_dmac_sg *axi_dmac_fill_linear_sg(struct axi_dmac_chan *chan,
>  	segment_size = ((segment_size - 1) | chan->length_align_mask) + 1;
>  
>  	for (i = 0; i < num_periods; i++) {
> -		len = period_len;
> -
> -		while (len > segment_size) {
> +		for (len = period_len; len > segment_size; sg++) {
>  			if (direction == DMA_DEV_TO_MEM)
>  				sg->dest_addr = addr;
>  			else
>  				sg->src_addr = addr;
>  			sg->x_len = segment_size;
>  			sg->y_len = 1;
> -			sg++;
>  			addr += segment_size;
>  			len -= segment_size;
>  		}
> -- 
> 2.42.0
> 

-- 
~Vinod