linux-kernel - Re: [PATCH] ieee802154: remove a redundant local variable 'i'

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Date:   Thu, 27 Sep 2018 16:47:32 +0200
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     zhong jiang <zhongjiang@...wei.com>, davem@...emloft.net
Cc:     alex.aring@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ieee802154: remove a redundant local variable 'i'

Hello.

On 19/09/2018 16:41, zhong jiang wrote:
> The local variable 'i' is never used after being assigned.
> hence it should be redundant adn can be removed.
> 
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  net/ieee802154/nl802154.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
> index 99f6c25..5b90151 100644
> --- a/net/ieee802154/nl802154.c
> +++ b/net/ieee802154/nl802154.c
> @@ -445,7 +445,6 @@ static int nl802154_send_wpan_phy(struct cfg802154_registered_device *rdev,
>  {
>  	struct nlattr *nl_cmds;
>  	void *hdr;
> -	int i;
>  
>  	hdr = nl802154hdr_put(msg, portid, seq, flags, cmd);
>  	if (!hdr)
> @@ -508,7 +507,6 @@ static int nl802154_send_wpan_phy(struct cfg802154_registered_device *rdev,
>  	if (!nl_cmds)
>  		goto nla_put_failure;
>  
> -	i = 0;
>  #define CMD(op, n)							\
>  	do {								\
>  		if (rdev->ops->op) {					\
> 

Sorry, but this patch is wrong. The variable i is used in line 513
inside the CMD() macro. The compiler clearly tells this when running
with your patch:

net/ieee802154/nl802154.c: In function ‘nl802154_send_wpan_phy’:
net/ieee802154/nl802154.c:513:4: error: ‘i’ undeclared (first use in
this function)

I would appreciate if patches sent out would at least be compile tested.

regards
Stefan Schmidt