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

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Date:   Fri, 21 Jan 2022 13:40:55 +0100
From:   Olivier Dautricourt <olivier.dautricourt@...lia.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Stefan Roese <sr@...x.de>, Vinod Koul <vkoul@...nel.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        dmaengine@...r.kernel.org
Subject: Re: [PATCH] dmaengine: altera-msgdma: Remove useless DMA-32 fallback
 configuration

The 01/15/2022 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@infradead.org/#t
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Acked-by: Olivier Dautricourt <olivier.dautricourt@...lia.com>

> ---
>  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);
> --
> 2.32.0
>