linux-kernel - Re: [PATCH 2/2] video: simplify cx18_get_input() and ivtv_get

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Message-ID: <48F3C060.2050302@gmail.com>
Date:	Mon, 13 Oct 2008 17:40:48 -0400
From:	Robert William Fuller <hydrologiccycle@...il.com>
To:	Hans Verkuil <hverkuil@...all.nl>
CC:	Németh Márton <nm127@...email.hu>,
	video4linux-list@...hat.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] video: simplify cx18_get_input() and	ivtv_get_input()

Hans Verkuil wrote:
> On Monday 13 October 2008 22:54:06 Németh Márton wrote:
>> From: Márton Németh <nm127@...email.hu>
>>
>> The cx18_get_input() and ivtv_get_input() are called
>> once from the VIDIOC_ENUMINPUT ioctl() and once from
>> the *_log_status() functions. In the first case the
>> struct v4l2_input is already filled with zeros,
>> so doing this again is unnecessary.
> 
> And in the second case no one cares whether the struct is zeroed. And 
> the same situation is also true for ivtv_get_output().

Yeah, 'cos there's nothing better than uninitialized fields, like the 
recent report of a control that returns minimum and maximum values of 
zero, but a step-size of 9.  Why are we optimizing code paths that are 
not performance critical by uninitializing memory?
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