1 files changed, 49 insertions, 0 deletions

diff --git a/sound/hda/array.c b/sound/hda/array.c
new file mode 100644
index 000000000000..516795baa7db
--- /dev/null
+++ b/sound/hda/array.c
@@ -0,0 +1,49 @@
+/*
+ * generic arrays
+ */
+
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/hdaudio.h>
+
+/**
+ * snd_array_new - get a new element from the given array
+ * @array: the array object
+ *
+ * Get a new element from the given array.  If it exceeds the
+ * pre-allocated array size, re-allocate the array.
+ *
+ * Returns NULL if allocation failed.
+ */
+void *snd_array_new(struct snd_array *array)
+{
+        if (snd_BUG_ON(!array->elem_size))
+                return NULL;
+        if (array->used >= array->alloced) {
+                int num = array->alloced + array->alloc_align;
+                int size = (num + 1) * array->elem_size;
+                void *nlist;
+                if (snd_BUG_ON(num >= 4096))
+                        return NULL;
+                nlist = krealloc(array->list, size, GFP_KERNEL | __GFP_ZERO);
+                if (!nlist)
+                        return NULL;
+                array->list = nlist;
+                array->alloced = num;
+        }
+        return snd_array_elem(array, array->used++);
+}
+EXPORT_SYMBOL_GPL(snd_array_new);
+
+/**
+ * snd_array_free - free the given array elements
+ * @array: the array object
+ */
+void snd_array_free(struct snd_array *array)
+{
+        kfree(array->list);
+        array->used = 0;
+        array->alloced = 0;
+        array->list = NULL;
+}
+EXPORT_SYMBOL_GPL(snd_array_free);