linux-kernel - Re: [PATCH] i2c: busses: Use dma_set_mask_and

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Message-ID: <20201202160147.GG13425@kunai>
Date:   Wed, 2 Dec 2020 17:01:47 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Youling Tang <tangyouling@...ngson.cn>
Cc:     Seth Heasley <seth.heasley@...el.com>,
        Neil Horman <nhorman@...driver.com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: busses: Use dma_set_mask_and_coherent

On Tue, Nov 24, 2020 at 09:08:35PM +0800, Youling Tang wrote:
> 'pci_set_dma_mask()' + 'pci_set_consistent_dma_mask()' can be replaced by
> an equivalent 'dma_set_mask_and_coherent()' which is much less verbose.
> 
> Signed-off-by: Youling Tang <tangyouling@...ngson.cn>

Please use "i2c: ismt:", so driver maintainers know that the patch is
relevant to them.

> ---
>  drivers/i2c/busses/i2c-ismt.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c
> index a35a27c..5f49830 100644
> --- a/drivers/i2c/busses/i2c-ismt.c
> +++ b/drivers/i2c/busses/i2c-ismt.c
> @@ -903,16 +903,12 @@ ismt_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		return -ENODEV;
>  	}
>  
> -	if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) != 0) ||
> -	    (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)) != 0)) {
> -		if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) ||
> -		    (pci_set_consistent_dma_mask(pdev,
> -						 DMA_BIT_MASK(32)) != 0)) {
> +	if (dma_set_mask_and_coherent(pdev, DMA_BIT_MASK(64)) != 0)
> +		if (dma_set_mask_and_coherent(pdev, DMA_BIT_MASK(32)) != 0) {
>  			dev_err(&pdev->dev, "pci_set_dma_mask fail %p\n",
>  				pdev);
>  			return -ENODEV;
>  		}
> -	}
>  
>  	err = ismt_dev_init(priv);
>  	if (err)
> -- 
> 2.1.0
> 

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