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authorTakashi Iwai <tiwai@suse.de>2015-03-03 19:33:10 +0300
committerTakashi Iwai <tiwai@suse.de>2015-03-23 15:19:35 +0300
commit71fc4c7ef5ef2d0ddd22f0545ede4c135b554b84 (patch)
tree2fad250a6c6f229aabd6b1aab41d24a50da511d9 /sound/hda/array.c
parente311782acd196d17d25b323d115709c50c8f7d3f (diff)
downloadlinux-71fc4c7ef5ef2d0ddd22f0545ede4c135b554b84.tar.xz
ALSA: hda - Move generic array helpers to core lib
This will be used by the regmap support. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda/array.c')
-rw-r--r--sound/hda/array.c49
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);