linux-kernel - [PATCH] ALSA: usb-audio: constify snd_kcontrol

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Date:   Wed, 22 Feb 2017 01:33:27 +0530
From:   Bhumika Goyal <bhumirks@...il.com>
To:     julia.lawall@...6.fr, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     Bhumika Goyal <bhumirks@...il.com>
Subject: [PATCH] ALSA: usb-audio: constify snd_kcontrol_new structures

Declare snd_kcontrol_new structures as const as they are only passed as
an argument to the function add_new_ctl. This agrument is of type const,
so snd_kcontrol_new structures having this property can be made const
too.

Signed-off-by: Bhumika Goyal <bhumirks@...il.com>
---
 sound/usb/mixer_scarlett.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/usb/mixer_scarlett.c b/sound/usb/mixer_scarlett.c
index 7438e7c..c33e237 100644
--- a/sound/usb/mixer_scarlett.c
+++ b/sound/usb/mixer_scarlett.c
@@ -477,7 +477,7 @@ static int scarlett_ctl_meter_get(struct snd_kcontrol *kctl,
 	return 0;
 }
 
-static struct snd_kcontrol_new usb_scarlett_ctl_switch = {
+static const struct snd_kcontrol_new usb_scarlett_ctl_switch = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "",
 	.info = scarlett_ctl_switch_info,
@@ -487,7 +487,7 @@ static int scarlett_ctl_meter_get(struct snd_kcontrol *kctl,
 
 static const DECLARE_TLV_DB_SCALE(db_scale_scarlett_gain, -12800, 100, 0);
 
-static struct snd_kcontrol_new usb_scarlett_ctl = {
+static const struct snd_kcontrol_new usb_scarlett_ctl = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 		  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
@@ -499,7 +499,7 @@ static int scarlett_ctl_meter_get(struct snd_kcontrol *kctl,
 	.tlv = { .p = db_scale_scarlett_gain }
 };
 
-static struct snd_kcontrol_new usb_scarlett_ctl_master = {
+static const struct snd_kcontrol_new usb_scarlett_ctl_master = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 		  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
@@ -511,7 +511,7 @@ static int scarlett_ctl_meter_get(struct snd_kcontrol *kctl,
 	.tlv = { .p = db_scale_scarlett_gain }
 };
 
-static struct snd_kcontrol_new usb_scarlett_ctl_enum = {
+static const struct snd_kcontrol_new usb_scarlett_ctl_enum = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "",
 	.info = scarlett_ctl_enum_info,
@@ -519,7 +519,7 @@ static int scarlett_ctl_meter_get(struct snd_kcontrol *kctl,
 	.put =  scarlett_ctl_enum_put,
 };
 
-static struct snd_kcontrol_new usb_scarlett_ctl_dynamic_enum = {
+static const struct snd_kcontrol_new usb_scarlett_ctl_dynamic_enum = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "",
 	.info = scarlett_ctl_enum_dynamic_info,
@@ -527,7 +527,7 @@ static int scarlett_ctl_meter_get(struct snd_kcontrol *kctl,
 	.put =  scarlett_ctl_enum_put,
 };
 
-static struct snd_kcontrol_new usb_scarlett_ctl_sync = {
+static const struct snd_kcontrol_new usb_scarlett_ctl_sync = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 	.name = "",
-- 
1.9.1