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

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Date:   Fri, 28 Sep 2018 14:37:53 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     Stefan Schmidt <stefan@...enfreihafen.org>
CC:     <davem@...emloft.net>, <alex.aring@...il.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ieee802154: remove a redundant local variable 'i'

On 2018/9/27 22:47, Stefan Schmidt wrote:
> 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.
Sorry, I really double check and compile test.

Thanks,
zhong jiang
> regards
> Stefan Schmidt
>
> .
>