linux-kernel - Re: [PATCH] soc: ti: knav_dma: Use proper enum in pktdma_init

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Date:   Sat, 26 Jan 2019 12:11:15 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Santosh Shilimkar <ssantosh@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] soc: ti: knav_dma: Use proper enum in pktdma_init_chan

On Mon, Dec 10, 2018 at 05:41:14PM -0700, Nathan Chancellor wrote:
> Clang warns when one enumerated type is implicitly converted to another:
> 
> drivers/soc/ti/knav_dma.c:601:20: warning: implicit conversion from
> enumeration type 'enum dma_data_direction' to different enumeration type
> 'enum dma_transfer_direction' [-Wenum-conversion]
>         chan->direction = DMA_NONE;
>                         ~ ^~~~~~~~
> 1 warning generated.
> 
> While DMA_NONE and DMA_TRANS_NONE have different values, there is no
> functional change because direction is never checked against DMA_NONE,
> only against DMA_MEM_TO_DEV and DMA_DEV_TO_MEM.
> 
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  drivers/soc/ti/knav_dma.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/ti/knav_dma.c b/drivers/soc/ti/knav_dma.c
> index e05ab16d9a9e..6285cd8efb21 100644
> --- a/drivers/soc/ti/knav_dma.c
> +++ b/drivers/soc/ti/knav_dma.c
> @@ -598,7 +598,7 @@ static int pktdma_init_chan(struct knav_dma_device *dma,
>  
>  	INIT_LIST_HEAD(&chan->list);
>  	chan->dma	= dma;
> -	chan->direction	= DMA_NONE;
> +	chan->direction	= DMA_TRANS_NONE;
>  	atomic_set(&chan->ref_count, 0);
>  	spin_lock_init(&chan->lock);
>  
> -- 
> 2.20.0
> 

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