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-rw-r--r--sound/hda/array.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/sound/hda/array.c b/sound/hda/array.c
new file mode 100644
index 000000000..a204dcee0
--- /dev/null
+++ b/sound/hda/array.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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 oldsize = array->alloced * array->elem_size;
+ int size = (num + 1) * array->elem_size;
+ void *nlist;
+ if (snd_BUG_ON(num >= 4096))
+ return NULL;
+ nlist = krealloc(array->list, size, GFP_KERNEL);
+ if (!nlist)
+ return NULL;
+ memset(nlist + oldsize, 0, size - oldsize);
+ 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);