linux-kernel - Re: [PATCH linux-next] octeontx2-af: Remove redundant assignment operations

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Date:   Wed, 20 Oct 2021 11:18:53 +0200
From:   Simon Horman <horms@...nel.org>
To:     luo penghao <cgel.zte@...il.com>
Cc:     Mirko Lindner <mlindner@...vell.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, penghao luo <luo.penghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH linux-next] octeontx2-af: Remove redundant assignment
 operations

On Mon, Oct 18, 2021 at 09:16:12AM +0000, luo penghao wrote:
> From: penghao luo <luo.penghao@....com.cn>

I think the correct patch-prefix for this would be:

[PATCH net-next] sky2:

> 
> the variable err will be reassigned on subsequent branches, and this
> assignment does not perform related value operations.
> 
> clang_analyzer complains as follows:
> 
> drivers/net/ethernet/marvell/sky2.c:4988: warning:
> 
> Although the value stored to 'err' is used in the enclosing expression,
> the value is never actually read from 'err'.
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: penghao luo <luo.penghao@....com.cn>
> ---
>  drivers/net/ethernet/marvell/sky2.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
> index 3cb9c12..6428ae5 100644
> --- a/drivers/net/ethernet/marvell/sky2.c
> +++ b/drivers/net/ethernet/marvell/sky2.c
> @@ -4907,7 +4907,7 @@ static int sky2_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	pci_set_master(pdev);
>  
>  	if (sizeof(dma_addr_t) > sizeof(u32) &&
> -	    !(err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))) {
> +	    !(dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))) {

I think you can drop the parentheses around the call to dma_set_mask()

>  		using_dac = 1;
>  		err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
>  		if (err < 0) {
> -- 
> 2.15.2
> 
>