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

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Date:	Sat, 01 Nov 2008 21:00:05 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Hans Verkuil <hverkuil@...all.nl>
CC:	Robert William Fuller <hydrologiccycle@...il.com>,
	video4linux-list@...hat.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] video: simplify cx18_get_input() and ivtv_get_input()

From: Márton Németh <nm127@...email.hu>

The cx18_get_input() and ivtv_get_input() are called
once from the VIDIOC_ENUMINPUT ioctl() (see
drivers/media/video/v4l2-ioctl.c:1165) 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.

The second case is only used for debugging purposes
from the VIDIOC_LOG_STATUS ioctl(). Currently only
the "name" field is used in the *_log_status() functions.

Signed-off-by: Márton Németh <nm127@...email.hu>
---
diff -upr linux-2.6.28-rc1.orig/drivers/media/video/cx18/cx18-cards.c linux-2.6.28-rc1/drivers/media/video/cx18/cx18-cards.c
--- linux-2.6.28-rc1.orig/drivers/media/video/cx18/cx18-cards.c	2008-11-01 20:27:58.000000000 +0100
+++ linux-2.6.28-rc1/drivers/media/video/cx18/cx18-cards.c	2008-11-01 20:36:39.000000000 +0100
@@ -419,10 +419,8 @@ int cx18_get_input(struct cx18 *cx, u16
 		"Composite 3"
 	};

-	memset(input, 0, sizeof(*input));
 	if (index >= cx->nof_inputs)
 		return -EINVAL;
-	input->index = index;
 	strlcpy(input->name, input_strs[card_input->video_type - 1],
 			sizeof(input->name));
 	input->type = (card_input->video_type == CX18_CARD_INPUT_VID_TUNER ?
diff -upr linux-2.6.28-rc1.orig/drivers/media/video/ivtv/ivtv-cards.c linux-2.6.28-rc1/drivers/media/video/ivtv/ivtv-cards.c
--- linux-2.6.28-rc1.orig/drivers/media/video/ivtv/ivtv-cards.c	2008-10-10 00:13:53.000000000 +0200
+++ linux-2.6.28-rc1/drivers/media/video/ivtv/ivtv-cards.c	2008-11-01 20:37:27.000000000 +0100
@@ -1199,10 +1199,8 @@ int ivtv_get_input(struct ivtv *itv, u16
 		"Composite 3"
 	};

-	memset(input, 0, sizeof(*input));
 	if (index >= itv->nof_inputs)
 		return -EINVAL;
-	input->index = index;
 	strlcpy(input->name, input_strs[card_input->video_type - 1],
 			sizeof(input->name));
 	input->type = (card_input->video_type == IVTV_CARD_INPUT_VID_TUNER ?
--
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