ALSA: pcm: Constify the list in snd_pcm_hw_constraint_list

Allows the constraint lists to be declared const by drivers which seems
reasonable; there's plenty of other constification we could do if we were
being complete but this was easy and quick.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 5 insertions, 3 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 0cf91b2f08ca..4ae9e22c4827 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -264,7 +264,7 @@ struct snd_pcm_hw_constraint_ratdens {
 
 struct snd_pcm_hw_constraint_list {
         unsigned int count;
-        unsigned int *list;
+        const unsigned int *list;
         unsigned int mask;
 };
 
@@ -781,7 +781,8 @@ void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interva
                           unsigned int k, struct snd_interval *c);
 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
                           const struct snd_interval *b, struct snd_interval *c);
-int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
+int snd_interval_list(struct snd_interval *i, unsigned int count,
+                      const unsigned int *list, unsigned int mask);
 int snd_interval_ratnum(struct snd_interval *i,
                         unsigned int rats_count, struct snd_ratnum *rats,
                         unsigned int *nump, unsigned int *denp);
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 3420bd3da5d7..4d18941178e6 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -1029,7 +1029,8 @@ static int snd_interval_ratden(struct snd_interval *i,
  *
  * Returns non-zero if the value is changed, zero if not changed.
  */
-int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
+int snd_interval_list(struct snd_interval *i, unsigned int count,
+                      const unsigned int *list, unsigned int mask)
 {
         unsigned int k;
         struct snd_interval list_range;