linux-kernel - Re: [PATCH RESEND] uio: uio_dmem

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Date:   Fri, 3 Dec 2021 15:17:52 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] uio: uio_dmem_genirq: Catch the Exception

On Thu, Dec 02, 2021 at 05:18:39PM +0800, Jiasheng Jiang wrote:
> The return value of dma_set_coherent_mask() is not always 0.
> To catch the exception in case that dma is not support the mask.
> 
> Fixes: 0a0c3b5a24bd ("Add new uio device for dynamic memory allocation")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/uio/uio_dmem_genirq.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c
> index 6b5cfa5b0673..570f5be64b46 100644
> --- a/drivers/uio/uio_dmem_genirq.c
> +++ b/drivers/uio/uio_dmem_genirq.c
> @@ -188,7 +188,9 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  	}
>  
> -	dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +	if (ret)
> +		return ret;

Please print out an error like the other failures above this in the
function.

And why is this a RESEND?  When was it sent before?

thanks,

greg k-h