Re: [PATCH] dmaengine: altera-msgdma: Remove useless DMA-32 fallback configuration

[Stefan Roese]

On 1/15/22 08:40, Christophe JAILLET wrote:
> As stated in [1], dma_set_mask() with a 64-bit mask never fails if
> dev->dma_mask is non-NULL.
> So, if it fails, the 32 bits case will also fail for the same reason.
>
> Simplify code and remove some dead code accordingly.
>
> [1]: https://lore.kernel.org/linux-kernel/YL3vSPK5DXTNvgdx@xxxxxxxxxxxxx/#t
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>

Reviewed-by: Stefan Roese <sr@xxxxxxx>

Thanks,
Stefan

> ---
>   drivers/dma/altera-msgdma.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/dma/altera-msgdma.c b/drivers/dma/altera-msgdma.c
> index f5b885d69cd3..6f56dfd375e3 100644
> --- a/drivers/dma/altera-msgdma.c
> +++ b/drivers/dma/altera-msgdma.c
> @@ -891,9 +891,7 @@ static int msgdma_probe(struct platform_device *pdev)
>   	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
>   	if (ret) {
>   		dev_warn(&pdev->dev, "unable to set coherent mask to 64");
> -		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> -		if (ret)
> -			goto fail;
> +		goto fail;
>   	}
>   
>   	msgdma_reset(mdev);

Viele Grüße,
Stefan Roese

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