linux-kernel - Re: [PATCH] IB/hfi1: Remove useless DMA-32 fallback configuration

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Date:   Fri, 18 Mar 2022 12:22:07 -0400
From:   Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
To:     cgel.zte@...il.com
Cc:     jgg@...pe.ca, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] IB/hfi1: Remove useless DMA-32 fallback configuration


On 3/17/22 9:00 PM, 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/infiniband/hw/hfi1/pcie.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c
> index a0802332c8cb..b8394cd358a9 100644
> --- a/drivers/infiniband/hw/hfi1/pcie.c
> +++ b/drivers/infiniband/hw/hfi1/pcie.c
> @@ -57,11 +57,8 @@ int hfi1_pcie_init(struct hfi1_devdata *dd)
>  		 * do not setup 64 bit maps on systems with 2GB or less
>  		 * memory installed.
>  		 */

Please remove the comment also since it no longer applies.

> -		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> -		if (ret) {
>  		dd_dev_err(dd, "Unable to set DMA mask: %d\n", ret);
>  		goto bail;

Also then unindent these two lines.

> -		}
>  	}
>  
>  	pci_set_master(pdev);

-Denny