linux-kernel - Re: [PATCH linux-next] e1000: Remove redundant statement

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Message-ID: <20211020092537.GF3935@kernel.org>
Date:   Wed, 20 Oct 2021 11:25:37 +0200
From:   Simon Horman <horms@...nel.org>
To:     luo penghao <cgel.zte@...il.com>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, luo penghao <luo.penghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH linux-next] e1000: Remove redundant statement

On Mon, Oct 18, 2021 at 08:53:05AM +0000, luo penghao wrote:

nit: s/linux-next/net-next/ in subject

> This statement is redundant in the context, because there will be
> an identical statement next. otherwise, the variable initialization
> is actually unnecessary.
> 
> The clang_analyzer complains as follows:
> 
> drivers/net/ethernet/intel/e1000/e1000_ethtool.c:1218:2 warning:
> 
> Value stored to 'ctrl_reg' is never read.

I agree this does seem to be the case.

> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: luo penghao <luo.penghao@....com.cn>

Reviewed-by: Simon Horman <horms@...nel.org>

> ---
>  drivers/net/ethernet/intel/e1000/e1000_ethtool.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
> index 0a57172..8951f2a 100644
> --- a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
> @@ -1215,8 +1215,6 @@ static int e1000_integrated_phy_loopback(struct e1000_adapter *adapter)
>  		e1000_write_phy_reg(hw, PHY_CTRL, 0x8140);
>  	}
>  
> -	ctrl_reg = er32(CTRL);
> -
>  	/* force 1000, set loopback */
>  	e1000_write_phy_reg(hw, PHY_CTRL, 0x4140);
>  
> -- 
> 2.15.2
> 
>