netdev - Re: [PATCH 6/9] ser_gigaset: checkpatch cleanup

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Date:	Tue, 27 Oct 2009 00:59:20 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Joe Perches <joe@...ches.com>
CC:	David Miller <davem@...emloft.net>,
	Karsten Keil <isdn@...ux-pingi.de>,
	Hansjoerg Lipp <hjlipp@....de>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, isdn4linux@...tserv.isdn4linux.de,
	i4ldeveloper@...tserv.isdn4linux.de
Subject: Re: [PATCH 6/9] ser_gigaset: checkpatch cleanup

Am 26.10.2009 01:54 schrieb Joe Perches:
> On Sun, 2009-10-25 at 20:30 +0100, Tilman Schmidt wrote:
>> Duly uglified as demanded by checkpatch.pl.
>> diff --git a/drivers/isdn/gigaset/ser-gigaset.c b/drivers/isdn/gigaset/ser-gigaset.c
>> index 3071a52..ac3409e 100644
>> --- a/drivers/isdn/gigaset/ser-gigaset.c
>> +++ b/drivers/isdn/gigaset/ser-gigaset.c
>> @@ -164,9 +164,15 @@ static void gigaset_modem_fill(unsigned long data)
>>  {
>>  	struct cardstate *cs = (struct cardstate *) data;
>>  	struct bc_state *bcs;
>> +	struct sk_buff *nextskb;
>>  	int sent = 0;
>>  
>> -	if (!cs || !(bcs = cs->bcs)) {
>> +	if (!cs) {
>> +		gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__);
>> +		return;
>> +	}
>> +	bcs = cs->bcs;
>> +	if (!bcs) {
>>  		gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__);
>>  		return;
>> 	}
> 
> perhaps:
> 	if (!cs || !cs->bcs) {
> 		gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__);
> 		return;
> 	}
> 	bcs = cs->bcs;

That would evaluate cs->bcs twice, and is also, in my experience,
significantly more prone to easily overlooked typos which result in
checking a different pointer in the if statement than the one that's
actually used in the subsequent assignment.

>> @@ -404,16 +412,20 @@ static void gigaset_device_release(struct device *dev)
>>  static int gigaset_initcshw(struct cardstate *cs)
>>  {
>>  	int rc;
>> +	struct ser_cardstate *scs;
>>  
>> -	if (!(cs->hw.ser = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL))) {
>> +	scs = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL);
>> +	if (!scs) {
>>  		pr_err("out of memory\n");
>>  		return 0;
>>  	}
>> +	cs->hw.ser = scs;
> 
> Why not no temporary and just:
> 
> 	cs->hw.ser = kzalloc...
> 	if (!cs->hw.ser)

For the same reasons as above.

Thanks,
Tilman

-- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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