ALSA: declare snd_kcontrol_new structures as const

Declare snd_kcontrol_new structures as const as they are only passed an
argument to the function snd_ctl_new1. This argument is of type const,
so snd_kcontrol_new structures having this property can be made const.
Done using Coccinelle:

@r disable optional_qualifier@
identifier x;
position p;
@@
static struct snd_kcontrol_new x@p={...};

@ok@
identifier r.x;
position p;
@@
snd_ctl_new1(&x@p,...)

@bad@
position p != {r.p,ok.p};
identifier r.x;
@@
x@p

@depends on !bad disable optional_qualifier@
identifier r.x;
@@
+const
struct snd_kcontrol_new x;

Cross compiled these files:
sound/aoa/codecs/tas.c - powerpc
sound/mips/{hal2.c/sgio2audio.c} - mips
sound/ppc/{awacs.c/beep.c/tumbler.c} - powerpc
sound/soc/sh/siu_dai.c - sh
Could not find an architecture to compile sound/sh/aica.c.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/aoa/codecs/tas.c

@@ -271,7 +271,7 @@ static int tas_snd_vol_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new volume_control = {
+static const struct snd_kcontrol_new volume_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Master Playback Volume",
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -314,7 +314,7 @@ static int tas_snd_mute_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new mute_control = {
+static const struct snd_kcontrol_new mute_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Master Playback Switch",
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -426,7 +426,7 @@ static int tas_snd_drc_range_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new drc_range_control = {
+static const struct snd_kcontrol_new drc_range_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "DRC Range",
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -466,7 +466,7 @@ static int tas_snd_drc_switch_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new drc_switch_control = {
+static const struct snd_kcontrol_new drc_switch_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "DRC Range Switch",
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -524,7 +524,7 @@ static int tas_snd_capture_source_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new capture_source_control = {
+static const struct snd_kcontrol_new capture_source_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	/* If we name this 'Input Source', it properly shows up in
 	 * alsamixer as a selection, * but it's shown under the
@@ -586,7 +586,7 @@ static int tas_snd_treble_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new treble_control = {
+static const struct snd_kcontrol_new treble_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Treble",
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -637,7 +637,7 @@ static int tas_snd_bass_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new bass_control = {
+static const struct snd_kcontrol_new bass_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Bass",
 	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,

sound/aoa/fabrics/layout.c

@@ -707,7 +707,7 @@ static int detect_choice_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new headphone_detect_choice = {
+static const struct snd_kcontrol_new headphone_detect_choice = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Headphone Detect Autoswitch",
 	.info = control_info,
@@ -717,7 +717,7 @@ static struct snd_kcontrol_new headphone_detect_choice = {
 	.private_value = 0,
 };
 
-static struct snd_kcontrol_new lineout_detect_choice = {
+static const struct snd_kcontrol_new lineout_detect_choice = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Line-Out Detect Autoswitch",
 	.info = control_info,
@@ -749,7 +749,7 @@ static int detected_get(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
-static struct snd_kcontrol_new headphone_detected = {
+static const struct snd_kcontrol_new headphone_detected = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Headphone Detected",
 	.info = control_info,
@@ -758,7 +758,7 @@ static struct snd_kcontrol_new headphone_detected = {
 	.private_value = 0,
 };
 
-static struct snd_kcontrol_new lineout_detected = {
+static const struct snd_kcontrol_new lineout_detected = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Line-Out Detected",
 	.info = control_info,

sound/core/ctljack.c

@@ -23,7 +23,7 @@ static int jack_detect_kctl_get(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
-static struct snd_kcontrol_new jack_detect_kctl = {
+static const struct snd_kcontrol_new jack_detect_kctl = {
 	/* name is filled later */
 	.iface = SNDRV_CTL_ELEM_IFACE_CARD,
 	.access = SNDRV_CTL_ELEM_ACCESS_READ,

sound/drivers/vx/vx_mixer.c

@@ -455,7 +455,7 @@ static int vx_output_level_put(struct snd_kcontrol *kcontrol, struct snd_ctl_ele
 	return 0;
 }
 
-static struct snd_kcontrol_new vx_control_output_level = {
+static const struct snd_kcontrol_new vx_control_output_level = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access =	(SNDRV_CTL_ELEM_ACCESS_READWRITE |
 			 SNDRV_CTL_ELEM_ACCESS_TLV_READ),
@@ -514,7 +514,7 @@ static int vx_audio_src_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_v
 	return 0;
 }
 
-static struct snd_kcontrol_new vx_control_audio_src = {
+static const struct snd_kcontrol_new vx_control_audio_src = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name =		"Capture Source",
 	.info =		vx_audio_src_info,
@@ -558,7 +558,7 @@ static int vx_clock_mode_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_
 	return 0;
 }
 
-static struct snd_kcontrol_new vx_control_clock_mode = {
+static const struct snd_kcontrol_new vx_control_clock_mode = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name =		"Clock Mode",
 	.info =		vx_clock_mode_info,
@@ -717,7 +717,7 @@ static int vx_monitor_sw_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_
 
 static const DECLARE_TLV_DB_SCALE(db_scale_audio_gain, -10975, 25, 0);
 
-static struct snd_kcontrol_new vx_control_audio_gain = {
+static const struct snd_kcontrol_new vx_control_audio_gain = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access =	(SNDRV_CTL_ELEM_ACCESS_READWRITE |
 			 SNDRV_CTL_ELEM_ACCESS_TLV_READ),
@@ -727,14 +727,14 @@ static struct snd_kcontrol_new vx_control_audio_gain = {
 	.put =          vx_audio_gain_put,
 	.tlv = { .p = db_scale_audio_gain },
 };
-static struct snd_kcontrol_new vx_control_output_switch = {
+static const struct snd_kcontrol_new vx_control_output_switch = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name =         "PCM Playback Switch",
 	.info =         vx_audio_sw_info,
 	.get =          vx_audio_sw_get,
 	.put =          vx_audio_sw_put
 };
-static struct snd_kcontrol_new vx_control_monitor_gain = {
+static const struct snd_kcontrol_new vx_control_monitor_gain = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name =         "Monitoring Volume",
 	.access =	(SNDRV_CTL_ELEM_ACCESS_READWRITE |
@@ -744,7 +744,7 @@ static struct snd_kcontrol_new vx_control_monitor_gain = {
 	.put =          vx_audio_monitor_put,
 	.tlv = { .p = db_scale_audio_gain },
 };
-static struct snd_kcontrol_new vx_control_monitor_switch = {
+static const struct snd_kcontrol_new vx_control_monitor_switch = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name =         "Monitoring Switch",
 	.info =         vx_audio_sw_info,	/* shared */
@@ -805,7 +805,7 @@ static int vx_iec958_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_valu
 	return 0;
 }
 
-static struct snd_kcontrol_new vx_control_iec958_mask = {
+static const struct snd_kcontrol_new vx_control_iec958_mask = {
 	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
 	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
 	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
@@ -813,7 +813,7 @@ static struct snd_kcontrol_new vx_control_iec958_mask = {
 	.get =		vx_iec958_mask_get,
 };
 
-static struct snd_kcontrol_new vx_control_iec958 = {
+static const struct snd_kcontrol_new vx_control_iec958 = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
 	.name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 	.info =         vx_iec958_info,
@@ -878,7 +878,7 @@ static int vx_saturation_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_
 	return 0;
 }
 
-static struct snd_kcontrol_new vx_control_vu_meter = {
+static const struct snd_kcontrol_new vx_control_vu_meter = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 	/* name will be filled later */
@@ -886,7 +886,7 @@ static struct snd_kcontrol_new vx_control_vu_meter = {
 	.get =		vx_vu_meter_get,
 };
 
-static struct snd_kcontrol_new vx_control_peak_meter = {
+static const struct snd_kcontrol_new vx_control_peak_meter = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 	/* name will be filled later */
@@ -894,7 +894,7 @@ static struct snd_kcontrol_new vx_control_peak_meter = {
 	.get =		vx_peak_meter_get,
 };
 
-static struct snd_kcontrol_new vx_control_saturation = {
+static const struct snd_kcontrol_new vx_control_saturation = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name =		"Input Saturation",
 	.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,

sound/firewire/bebob/bebob_maudio.c

@@ -396,7 +396,7 @@ static int special_clk_ctl_put(struct snd_kcontrol *kctl,
 
 	return err;
 }
-static struct snd_kcontrol_new special_clk_ctl = {
+static const struct snd_kcontrol_new special_clk_ctl = {
 	.name	= "Clock Source",
 	.iface	= SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access	= SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -429,7 +429,7 @@ static int special_sync_ctl_get(struct snd_kcontrol *kctl,
 
 	return 0;
 }
-static struct snd_kcontrol_new special_sync_ctl = {
+static const struct snd_kcontrol_new special_sync_ctl = {
 	.name	= "Sync Status",
 	.iface	= SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access	= SNDRV_CTL_ELEM_ACCESS_READ,
@@ -521,7 +521,7 @@ static int special_dig_in_iface_ctl_set(struct snd_kcontrol *kctl,
 	mutex_unlock(&bebob->mutex);
 	return err;
 }
-static struct snd_kcontrol_new special_dig_in_iface_ctl = {
+static const struct snd_kcontrol_new special_dig_in_iface_ctl = {
 	.name	= "Digital Input Interface",
 	.iface	= SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access	= SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -577,7 +577,7 @@ static int special_dig_out_iface_ctl_set(struct snd_kcontrol *kctl,
 	mutex_unlock(&bebob->mutex);
 	return err;
 }
-static struct snd_kcontrol_new special_dig_out_iface_ctl = {
+static const struct snd_kcontrol_new special_dig_out_iface_ctl = {
 	.name	= "Digital Output Interface",
 	.iface	= SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access	= SNDRV_CTL_ELEM_ACCESS_READWRITE,

sound/mips/hal2.c

@@ -264,7 +264,7 @@ static int hal2_gain_put(struct snd_kcontrol *kcontrol,
 	return old != new;
 }
 
-static struct snd_kcontrol_new hal2_ctrl_headphone = {
+static const struct snd_kcontrol_new hal2_ctrl_headphone = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "Headphone Playback Volume",
 	.access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -274,7 +274,7 @@ static struct snd_kcontrol_new hal2_ctrl_headphone = {
 	.put            = hal2_gain_put,
 };
 
-static struct snd_kcontrol_new hal2_ctrl_mic = {
+static const struct snd_kcontrol_new hal2_ctrl_mic = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "Mic Capture Volume",
 	.access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,

sound/mips/sgio2audio.c

@@ -230,7 +230,7 @@ static int sgio2audio_source_put(struct snd_kcontrol *kcontrol,
 }
 
 /* dac1/pcm0 mixer control */
-static struct snd_kcontrol_new sgio2audio_ctrl_pcm0 = {
+static const struct snd_kcontrol_new sgio2audio_ctrl_pcm0 = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "PCM Playback Volume",
 	.index          = 0,
@@ -242,7 +242,7 @@ static struct snd_kcontrol_new sgio2audio_ctrl_pcm0 = {
 };
 
 /* dac2/pcm1 mixer control */
-static struct snd_kcontrol_new sgio2audio_ctrl_pcm1 = {
+static const struct snd_kcontrol_new sgio2audio_ctrl_pcm1 = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "PCM Playback Volume",
 	.index          = 1,
@@ -254,7 +254,7 @@ static struct snd_kcontrol_new sgio2audio_ctrl_pcm1 = {
 };
 
 /* record level mixer control */
-static struct snd_kcontrol_new sgio2audio_ctrl_reclevel = {
+static const struct snd_kcontrol_new sgio2audio_ctrl_reclevel = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "Capture Volume",
 	.access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -265,7 +265,7 @@ static struct snd_kcontrol_new sgio2audio_ctrl_reclevel = {
 };
 
 /* record level source control */
-static struct snd_kcontrol_new sgio2audio_ctrl_recsource = {
+static const struct snd_kcontrol_new sgio2audio_ctrl_recsource = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "Capture Source",
 	.access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
@@ -275,7 +275,7 @@ static struct snd_kcontrol_new sgio2audio_ctrl_recsource = {
 };
 
 /* line mixer control */
-static struct snd_kcontrol_new sgio2audio_ctrl_line = {
+static const struct snd_kcontrol_new sgio2audio_ctrl_line = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "Line Playback Volume",
 	.index          = 0,
@@ -287,7 +287,7 @@ static struct snd_kcontrol_new sgio2audio_ctrl_line = {
 };
 
 /* cd mixer control */
-static struct snd_kcontrol_new sgio2audio_ctrl_cd = {
+static const struct snd_kcontrol_new sgio2audio_ctrl_cd = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "Line Playback Volume",
 	.index          = 1,
@@ -299,7 +299,7 @@ static struct snd_kcontrol_new sgio2audio_ctrl_cd = {
 };
 
 /* mic mixer control */
-static struct snd_kcontrol_new sgio2audio_ctrl_mic = {
+static const struct snd_kcontrol_new sgio2audio_ctrl_mic = {
 	.iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name           = "Mic Playback Volume",
 	.access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,

sound/pcmcia/vx/vxp_mixer.c

@@ -69,7 +69,7 @@ static int vx_mic_level_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_v
 
 static const DECLARE_TLV_DB_SCALE(db_scale_mic, -21, 3, 0);
 
-static struct snd_kcontrol_new vx_control_mic_level = {
+static const struct snd_kcontrol_new vx_control_mic_level = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.access =	(SNDRV_CTL_ELEM_ACCESS_READWRITE |
 			 SNDRV_CTL_ELEM_ACCESS_TLV_READ),
@@ -109,7 +109,7 @@ static int vx_mic_boost_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_v
 	return 0;
 }
 
-static struct snd_kcontrol_new vx_control_mic_boost = {
+static const struct snd_kcontrol_new vx_control_mic_boost = {
 	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name =		"Mic Boost",
 	.info =		vx_mic_boost_info,

sound/ppc/awacs.c

@@ -514,7 +514,7 @@ static struct snd_kcontrol_new snd_pmac_awacs_amp_vol[] = {
 	},
 };
 
-static struct snd_kcontrol_new snd_pmac_awacs_amp_hp_sw = {
+static const struct snd_kcontrol_new snd_pmac_awacs_amp_hp_sw = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Headphone Playback Switch",
 	.info = snd_pmac_boolean_stereo_info,
@@ -523,7 +523,7 @@ static struct snd_kcontrol_new snd_pmac_awacs_amp_hp_sw = {
 	.private_value = AMP_CH_HD,
 };
 
-static struct snd_kcontrol_new snd_pmac_awacs_amp_spk_sw = {
+static const struct snd_kcontrol_new snd_pmac_awacs_amp_spk_sw = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Speaker Playback Switch",
 	.info = snd_pmac_boolean_stereo_info,

sound/ppc/beep.c

@@ -206,7 +206,7 @@ static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,
 	return oval != chip->beep->volume;
 }
 
-static struct snd_kcontrol_new snd_pmac_beep_mixer = {
+static const struct snd_kcontrol_new snd_pmac_beep_mixer = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Beep Playback Volume",
 	.info = snd_pmac_info_beep,

sound/ppc/tumbler.c

@@ -897,7 +897,7 @@ static struct snd_kcontrol_new snapper_mixers[] = {
 	},
 };
 
-static struct snd_kcontrol_new tumbler_hp_sw = {
+static const struct snd_kcontrol_new tumbler_hp_sw = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Headphone Playback Switch",
 	.info = snd_pmac_boolean_mono_info,
@@ -905,7 +905,7 @@ static struct snd_kcontrol_new tumbler_hp_sw = {
 	.put = tumbler_put_mute_switch,
 	.private_value = TUMBLER_MUTE_HP,
 };
-static struct snd_kcontrol_new tumbler_speaker_sw = {
+static const struct snd_kcontrol_new tumbler_speaker_sw = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Speaker Playback Switch",
 	.info = snd_pmac_boolean_mono_info,
@@ -913,7 +913,7 @@ static struct snd_kcontrol_new tumbler_speaker_sw = {
 	.put = tumbler_put_mute_switch,
 	.private_value = TUMBLER_MUTE_AMP,
 };
-static struct snd_kcontrol_new tumbler_lineout_sw = {
+static const struct snd_kcontrol_new tumbler_lineout_sw = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Line Out Playback Switch",
 	.info = snd_pmac_boolean_mono_info,
@@ -921,7 +921,7 @@ static struct snd_kcontrol_new tumbler_lineout_sw = {
 	.put = tumbler_put_mute_switch,
 	.private_value = TUMBLER_MUTE_LINE,
 };
-static struct snd_kcontrol_new tumbler_drc_sw = {
+static const struct snd_kcontrol_new tumbler_drc_sw = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "DRC Switch",
 	.info = snd_pmac_boolean_mono_info,

sound/sh/aica.c

@@ -535,7 +535,7 @@ static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
 	return 1;
 }
 
-static struct snd_kcontrol_new snd_aica_pcmswitch_control = {
+static const struct snd_kcontrol_new snd_aica_pcmswitch_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "PCM Playback Switch",
 	.index = 0,
@@ -544,7 +544,7 @@ static struct snd_kcontrol_new snd_aica_pcmswitch_control = {
 	.put = aica_pcmswitch_put
 };
 
-static struct snd_kcontrol_new snd_aica_pcmvolume_control = {
+static const struct snd_kcontrol_new snd_aica_pcmvolume_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "PCM Playback Volume",
 	.index = 0,

sound/soc/sh/siu_dai.c

@@ -441,7 +441,7 @@ static int siu_dai_put_volume(struct snd_kcontrol *kctrl,
 	return 0;
 }
 
-static struct snd_kcontrol_new playback_controls = {
+static const struct snd_kcontrol_new playback_controls = {
 	.iface		= SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name		= "PCM Playback Volume",
 	.index		= 0,
@@ -451,7 +451,7 @@ static struct snd_kcontrol_new playback_controls = {
 	.private_value	= VOLUME_PLAYBACK,
 };
 
-static struct snd_kcontrol_new capture_controls = {
+static const struct snd_kcontrol_new capture_controls = {
 	.iface		= SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name		= "PCM Capture Volume",
 	.index		= 0,

sound/usb/mixer_quirks.c

@@ -362,7 +362,7 @@ static int snd_audigy2nx_led_resume(struct usb_mixer_elem_list *list)
 }
 
 /* name and private_value are set dynamically */
-static struct snd_kcontrol_new snd_audigy2nx_control = {
+static const struct snd_kcontrol_new snd_audigy2nx_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.info = snd_audigy2nx_led_info,
 	.get = snd_audigy2nx_led_get,