ALSA: hda - Fix another cache list management

Fix another silly bug in the amp cache list management.

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

2 files changed, 13 insertions, 4 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 06e99c785155..5d5e8012d6a5 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -887,11 +887,10 @@ static struct hda_cache_head  *get_alloc_hash(struct hda_cache_rec *cache,
 {
         u16 idx = key % (u16)ARRAY_SIZE(cache->hash);
         u16 cur = cache->hash[idx];
-        struct hda_cache_head *info_head = cache->buf.list;
         struct hda_cache_head *info;
 
         while (cur != 0xffff) {
-                info = &info_head[cur];
+                info = snd_array_elem(&cache->buf, cur);
                 if (info->key == key)
                         return info;
                 cur = info->next;
@@ -901,7 +900,7 @@ static struct hda_cache_head  *get_alloc_hash(struct hda_cache_rec *cache,
         info = snd_array_new(&cache->buf);
         if (!info)
                 return NULL;
-        cur = cache->buf.used - 1; /* the last entry */
+        cur = snd_array_index(&cache->buf, info);
         info->key = key;
         info->val = 0;
         info->next = cache->hash[idx];
@@ -3414,7 +3413,7 @@ void *snd_array_new(struct snd_array *array)
                 array->list = nlist;
                 array->alloced = num;
         }
-        return array->list + (array->used++ * array->elem_size);
+        return snd_array_elem(array, array->used++);
 }
 
 /* free the given array elements */
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index a73f0eb99283..ee122b009fd4 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -539,6 +539,16 @@ static inline void snd_array_init(struct snd_array *array, unsigned int size,
         array->alloc_align = align;
 }
 
+static inline void *snd_array_elem(struct snd_array *array, unsigned int idx)
+{
+        return array->list + idx * array->elem_size;
+}
+
+static inline unsigned int snd_array_index(struct snd_array *array, void *ptr)
+{
+        return (unsigned long)(ptr - array->list) / array->elem_size;
+}
+
 /*
  * Structures
  */