linux-kernel - Re: [PATCH] net: macvlan: remove redundant initialization in macvlan_dev_netpoll

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Date:   Wed, 4 Nov 2020 13:35:49 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     menglong8.dong@...il.com
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, dingtianhong@...wei.com,
        Menglong Dong <dong.menglong@....com.cn>
Subject: Re: [PATCH] net: macvlan: remove redundant initialization in
 macvlan_dev_netpoll_setup

On Wed,  4 Nov 2020 06:53:11 -0500 menglong8.dong@...il.com wrote:
> From: Menglong Dong <dong.menglong@....com.cn>
> 
> The initialization for err with 0 seems useless, as it is soon updated
> with -ENOMEM. So, we can init err with -ENOMEM.
> 
> Signed-off-by: Menglong Dong <dong.menglong@....com.cn>
> ---
>  drivers/net/macvlan.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
> index dd96020..a568b39 100644
> --- a/drivers/net/macvlan.c
> +++ b/drivers/net/macvlan.c
> @@ -1096,10 +1096,9 @@ static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info
>  	struct macvlan_dev *vlan = netdev_priv(dev);
>  	struct net_device *real_dev = vlan->lowerdev;
>  	struct netpoll *netpoll;
> -	int err = 0;

Removing the ' = 0' would be better, let's keep the assignment of
-ENOMEM close to where it matters.

> +	int err = -ENOMEM;
>  
>  	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
> -	err = -ENOMEM;
>  	if (!netpoll)
>  		goto out;
>