linux-kernel - Re: [PATCH 4/4] dmaengine: zynqmp_dma: Typecast with enum to fix the coverity warning

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Date:   Thu, 23 Sep 2021 16:17:58 +0200
From:   Michael Tretter <m.tretter@...gutronix.de>
To:     Harini Katakam <harini.katakam@...inx.com>
Cc:     vkoul@...nel.org, romain.perier@...il.com, allen.lkml@...il.com,
        yukuai3@...wei.com, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        harinikatakamlinux@...il.com, michal.simek@...inx.com,
        radhey.shyam.pandey@...inx.com, shravya.kumbham@...inx.com,
        kernel@...gutronix.de
Subject: Re: [PATCH 4/4] dmaengine: zynqmp_dma: Typecast with enum to fix the
 coverity warning

On Tue, 14 Sep 2021 13:58:17 +0530, Harini Katakam wrote:
> From: Shravya Kumbham <shravya.kumbham@...inx.com>
> 
> Typecast the flags variable with (enum dma_ctrl_flags) in
> zynqmp_dma_prep_memcpy function to fix the coverity warning.
> 
> Addresses-Coverity: Event mixed_enum_type.
> Signed-off-by: Shravya Kumbham <shravya.kumbham@...inx.com>
> Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> ---
>  drivers/dma/xilinx/zynqmp_dma.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
> index 588460e56ab8..282d01ab402f 100644
> --- a/drivers/dma/xilinx/zynqmp_dma.c
> +++ b/drivers/dma/xilinx/zynqmp_dma.c
> @@ -849,7 +849,7 @@ static struct dma_async_tx_descriptor *zynqmp_dma_prep_memcpy(
>  
>  	zynqmp_dma_desc_config_eod(chan, desc);
>  	async_tx_ack(&first->async_tx);
> -	first->async_tx.flags = flags;
> +	first->async_tx.flags = (enum dma_ctrl_flags)flags;

Thanks for the patch.

I looked at a few dmaengine drivers, at it looks like all of them have this
issue. Maybe we should change the signature of the dmaengine_prep_dma_memcpy()
engine to accept "enum dma_ctrl_flags flags" instead of "unsigned long flags"?

Michael

>  	return &first->async_tx;
>  }
>  
> -- 
> 2.17.1
> 
> 
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> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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