linux-kernel - Re: [PATCH] virito-pci-modern: Remove useless DMA-32 fallback configuration

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Date:   Mon, 28 Mar 2022 16:45:08 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     cgel.zte@...il.com
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] virito-pci-modern: Remove useless DMA-32 fallback
 configuration

Typo in subj, and pls make subject match actual file name (_ not -).


On Fri, Mar 18, 2022 at 12:58:58AM +0000, cgel.zte@...il.com wrote:
> From: Minghao Chi <chi.minghao@....com.cn>
> 
> As stated in [1], dma_set_mask() with a 64-bit mask will never fail 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://lkml.org/lkml/2021/6/7/398
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
> ---
>  drivers/virtio/virtio_pci_modern_dev.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_pci_modern_dev.c b/drivers/virtio/virtio_pci_modern_dev.c
> index e8b3ff2b9fbc..dff0b15a239d 100644
> --- a/drivers/virtio/virtio_pci_modern_dev.c
> +++ b/drivers/virtio/virtio_pci_modern_dev.c
> @@ -255,9 +255,6 @@ int vp_modern_probe(struct virtio_pci_modern_device *mdev)
>  	}
>  
>  	err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64));
> -	if (err)
> -		err = dma_set_mask_and_coherent(&pci_dev->dev,
> -						DMA_BIT_MASK(32));
>  	if (err)
>  		dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA.  Trying to continue, but this might not work.\n");
>  
> -- 
> 2.25.1