linux-kernel - Re: [PATCH v2 10/13] dmaengine: qcom: bam_dma: use sg_nents_for

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Message-ID: <ibcqximr6bt7ed7eizuyhhsaqadgvuomy7qpefito26fjpiqwf@ptsxovmyt3le>
Date: Mon, 10 Nov 2025 09:07:56 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Stefan Wahren <wahrenst@....net>, Vinod Koul <vkoul@...nel.org>, 
	Thomas Andreatta <thomasandreatta2000@...il.com>, Caleb Sander Mateos <csander@...estorage.com>, 
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	linux-arm-msm@...r.kernel.org, Olivier Dautricourt <olivierdautricourt@...il.com>, 
	Stefan Roese <sr@...x.de>, Florian Fainelli <florian.fainelli@...adcom.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Ray Jui <rjui@...adcom.com>, 
	Scott Branden <sbranden@...adcom.com>, Lars-Peter Clausen <lars@...afoo.de>, 
	Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>, Daniel Mack <daniel@...que.org>, 
	Haojian Zhuang <haojian.zhuang@...il.com>, Robert Jarzmik <robert.jarzmik@...e.fr>, 
	Lizhi Hou <lizhi.hou@....com>, Brian Xu <brian.xu@....com>, 
	Raj Kumar Rampelli <raj.kumar.rampelli@....com>, Michal Simek <michal.simek@....com>, 
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 10/13] dmaengine: qcom: bam_dma: use
 sg_nents_for_dma() helper

On Mon, Nov 10, 2025 at 11:23:37AM +0100, Andy Shevchenko wrote:
> Instead of open coded variant let's use recently introduced helper.
> 

Reviewed-by: Bjorn Andersson <andersson@...nel.org>

Regards,
Bjorn

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/dma/qcom/bam_dma.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
> index 2cf060174795..62b3921f0d11 100644
> --- a/drivers/dma/qcom/bam_dma.c
> +++ b/drivers/dma/qcom/bam_dma.c
> @@ -655,22 +655,17 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
>  	struct scatterlist *sg;
>  	u32 i;
>  	struct bam_desc_hw *desc;
> -	unsigned int num_alloc = 0;
> -
> +	unsigned int num_alloc;
>  
>  	if (!is_slave_direction(direction)) {
>  		dev_err(bdev->dev, "invalid dma direction\n");
>  		return NULL;
>  	}
>  
> -	/* calculate number of required entries */
> -	for_each_sg(sgl, sg, sg_len, i)
> -		num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_FIFO_SIZE);
> -
>  	/* allocate enough room to accommodate the number of entries */
> +	num_alloc = sg_nents_for_dma(sgl, sg_len, BAM_FIFO_SIZE);
>  	async_desc = kzalloc(struct_size(async_desc, desc, num_alloc),
>  			     GFP_NOWAIT);
> -
>  	if (!async_desc)
>  		return NULL;
>  
> -- 
> 2.50.1
> 
>