linux-kernel - Re: [PATCH 1/1] PM-wakeup: Deletion of an unnecessary check before the function call "wakeup_source

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <546C9319.4040205@bfs.de>
Date:	Wed, 19 Nov 2014 13:54:49 +0100
From:	walter harms <wharms@....de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 1/1] PM-wakeup: Deletion of an unnecessary check before
 the function call "wakeup_source_unregister"



Am 19.11.2014 13:09, schrieb Dan Carpenter:
> On Wed, Nov 19, 2014 at 12:26:45PM +0100, SF Markus Elfring wrote:
>> --- a/drivers/base/power/wakeup.c
>> +++ b/drivers/base/power/wakeup.c
>> @@ -267,8 +267,7 @@ int device_wakeup_disable(struct device *dev)
>>  		return -EINVAL;
>>  
>>  	ws = device_wakeup_detach(dev);
>> -	if (ws)
>> -		wakeup_source_unregister(ws);
>> +	wakeup_source_unregister(ws);
> 
> In the original code, it's clear that the programmer thought about what
> happens when the device_wakeup_detach() returns NULL but in the new code
> that's not clear.
> 
> I guess the information is still there in the git archive, but why hide
> the good code by covering it with confusing code?
> 

hi,
just to add an other point of view ...

device_wakeup_detach returns dev->power.wakeup what is never NULL in this case.
(not visible here but a few line before exactly this is checked)

so this code can be compacted to:
wakeup_source_unregister(device_wakeup_detach(dev));

--readability

let the maintainer decide this byte-saving vs readability

re,
 wh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/