[alsa-devel] [PATCH 36/58] ALSA: hda: Constify snd_kcontrol_new items

[Takashi Iwai <tiwai@suse.de>]

Most of snd_kcontrol_new definitions are read-only and passed as-is.
Let's declare them as const for further optimization.

There should be no functional changes by this patch.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/pci/hda/hda_codec.c      | 8 ++++----
 sound/pci/hda/patch_sigmatel.c | 6 +++---
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 8f166bbc438b..d039eeec080f 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2387,7 +2387,7 @@ static int snd_hda_spdif_out_switch_put(struct snd_kcontrol *kcontrol,
 	return change;
 }
 
-static struct snd_kcontrol_new dig_mixes[] = {
+static const struct snd_kcontrol_new dig_mixes[] = {
 	{
 		.access = SNDRV_CTL_ELEM_ACCESS_READ,
 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
@@ -2437,7 +2437,7 @@ int snd_hda_create_dig_out_ctls(struct hda_codec *codec,
 {
 	int err;
 	struct snd_kcontrol *kctl;
-	struct snd_kcontrol_new *dig_mix;
+	const struct snd_kcontrol_new *dig_mix;
 	int idx = 0;
 	int val = 0;
 	const int spdif_index = 16;
@@ -2655,7 +2655,7 @@ static int snd_hda_spdif_in_status_get(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
-static struct snd_kcontrol_new dig_in_ctls[] = {
+static const struct snd_kcontrol_new dig_in_ctls[] = {
 	{
 		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 		.name = SNDRV_CTL_NAME_IEC958("", CAPTURE, SWITCH),
@@ -2687,7 +2687,7 @@ int snd_hda_create_spdif_in_ctls(struct hda_codec *codec, hda_nid_t nid)
 {
 	int err;
 	struct snd_kcontrol *kctl;
-	struct snd_kcontrol_new *dig_mix;
+	const struct snd_kcontrol_new *dig_mix;
 	int idx;
 
 	idx = find_empty_mixer_ctl_idx(codec, "IEC958 Capture Switch", 0);
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 8ecb53bce509..9b816b377547 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -825,11 +825,11 @@ static int stac_auto_create_beep_ctls(struct hda_codec *codec,
 	struct sigmatel_spec *spec = codec->spec;
 	u32 caps = query_amp_caps(codec, nid, HDA_OUTPUT);
 	struct snd_kcontrol_new *knew;
-	static struct snd_kcontrol_new abeep_mute_ctl =
+	static const struct snd_kcontrol_new abeep_mute_ctl =
 		HDA_CODEC_MUTE(NULL, 0, 0, 0);
-	static struct snd_kcontrol_new dbeep_mute_ctl =
+	static const struct snd_kcontrol_new dbeep_mute_ctl =
 		HDA_CODEC_MUTE_BEEP(NULL, 0, 0, 0);
-	static struct snd_kcontrol_new beep_vol_ctl =
+	static const struct snd_kcontrol_new beep_vol_ctl =
 		HDA_CODEC_VOLUME(NULL, 0, 0, 0);
 
 	/* check for mute support for the the amp */
-- 
2.16.4

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