ALSA: hda: Constify snd_kcontrol_new items

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.

Link: https://lore.kernel.org/r/20200103081714.9560-37-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 8f166bbc438b3fe41a0c7e9dd0621e78ddf59269..d039eeec080f3bd64c195c77504b74f5dcb7c564 100644 (file)
--- 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 8ecb53bce509cba9df073e338fb7fb7d5a739144..9b816b377547282c87c6c249fbcf9843bfdd922e 100644 (file)
--- 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 */