linux-kernel - Re: [PATCH] dmaengine: fsl-edma: remove redundant assignment to pointer last

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Date:   Fri, 1 Jul 2022 22:09:21 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Nathan Chancellor <nathan@...nel.org>, dmaengine@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: fsl-edma: remove redundant assignment to
 pointer last_sg

On 14-06-22, 19:47, Colin Ian King wrote:
> The pointer last_sg is being assigned a value at the start of a loop
> however it is never read and is being re-assigned later on in both
> brances of an if-statement. The assignment is redundant and can be
> removed.

Applied, thanks

> 
> Cleans up clang scan-build warning:
> drivers/dma/fsl-edma-common.c:563:3: warning: Value stored to 'last_sg'
> is never read [deadcode.DeadStores]
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---
>  drivers/dma/fsl-edma-common.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
> index 3ae05d1446a5..a06a1575a2a5 100644
> --- a/drivers/dma/fsl-edma-common.c
> +++ b/drivers/dma/fsl-edma-common.c
> @@ -559,9 +559,6 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
>  	}
>  
>  	for_each_sg(sgl, sg, sg_len, i) {
> -		/* get next sg's physical address */
> -		last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
> -
>  		if (direction == DMA_MEM_TO_DEV) {
>  			src_addr = sg_dma_address(sg);
>  			dst_addr = fsl_chan->dma_dev_addr;
> -- 
> 2.35.3

-- 
~Vinod