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

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Date:	Mon, 13 Oct 2008 22:54:06 +0200
From:	Németh Márton <nm127@...email.hu>
To:	video4linux-list@...hat.com
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [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() 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 *_log_status() functions are called from
VIDIOC_LOG_STATUS ioctl() which is only used for
debug purposes, so it is worth to move the filling
with zeros to a least frequently used function.

Signed-off-by: Márton Németh <nm127@...email.hu>
---
diff -upr linux-2.6.27.orig/drivers/media/video/cx18/cx18-cards.c linux-2.6.27/drivers/media/video/cx18/cx18-cards.c
--- linux-2.6.27.orig/drivers/media/video/cx18/cx18-cards.c	2008-10-10 00:13:53.000000000 +0200
+++ linux-2.6.27/drivers/media/video/cx18/cx18-cards.c	2008-10-13 21:27:54.000000000 +0200
@@ -320,10 +320,9 @@ 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-2.6.27.orig/drivers/media/video/cx18/cx18-ioctl.c linux-2.6.27/drivers/media/video/cx18/cx18-ioctl.c
--- linux-2.6.27.orig/drivers/media/video/cx18/cx18-ioctl.c	2008-10-10 00:13:53.000000000 +0200
+++ linux-2.6.27/drivers/media/video/cx18/cx18-ioctl.c	2008-10-13 21:28:11.000000000 +0200
@@ -712,7 +712,11 @@ static int cx18_log_status(struct file *
 		cx18_read_eeprom(cx, &tv);
 	}
 	cx18_call_i2c_clients(cx, VIDIOC_LOG_STATUS, NULL);
+
+	memset(&vidin, 0, sizeof(vidin));
+	vidin.index = cx->active_input;
 	cx18_get_input(cx, cx->active_input, &vidin);
+
 	cx18_get_audio_input(cx, cx->audio_input, &audin);
 	CX18_INFO("Video Input: %s\n", vidin.name);
 	CX18_INFO("Audio Input: %s\n", audin.name);
diff -upr linux-2.6.27.orig/drivers/media/video/ivtv/ivtv-cards.c linux-2.6.27/drivers/media/video/ivtv/ivtv-cards.c
--- linux-2.6.27.orig/drivers/media/video/ivtv/ivtv-cards.c	2008-10-10 00:13:53.000000000 +0200
+++ linux-2.6.27/drivers/media/video/ivtv/ivtv-cards.c	2008-10-13 21:22:59.000000000 +0200
@@ -1199,10 +1199,9 @@ 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 ?
diff -upr linux-2.6.27.orig/drivers/media/video/ivtv/ivtv-ioctl.c linux-2.6.27/drivers/media/video/ivtv/ivtv-ioctl.c
--- linux-2.6.27.orig/drivers/media/video/ivtv/ivtv-ioctl.c	2008-10-10 00:13:53.000000000 +0200
+++ linux-2.6.27/drivers/media/video/ivtv/ivtv-ioctl.c	2008-10-13 21:21:35.000000000 +0200
@@ -1446,7 +1446,11 @@ static int ivtv_log_status(struct file *
 		ivtv_read_eeprom(itv, &tv);
 	}
 	ivtv_call_i2c_clients(itv, VIDIOC_LOG_STATUS, NULL);
+
+	memset(&vidin, 0, sizeof(vidin));
+	vidin.index = itv->active_input;
 	ivtv_get_input(itv, itv->active_input, &vidin);
+
 	ivtv_get_audio_input(itv, itv->audio_input, &audin);
 	IVTV_INFO("Video Input:  %s\n", vidin.name);
 	IVTV_INFO("Audio Input:  %s%s\n", audin.name,
--
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