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@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/mixer_scarlett.c b/sound/usb/mixer_scarlett.c
index 7438e7c..c33e237 100644 (file)
--- 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 struct snd_kcontrol_new usb_scarlett_ctl_switch = {
 
 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 struct snd_kcontrol_new usb_scarlett_ctl = {
        .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 struct snd_kcontrol_new usb_scarlett_ctl_master = {
        .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 struct snd_kcontrol_new usb_scarlett_ctl_enum = {
        .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 struct snd_kcontrol_new usb_scarlett_ctl_dynamic_enum = {
        .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 = "",