1 files changed, 6 insertions, 0 deletions

diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index ba27f7ade670..e02653465e29 100644
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -53,6 +53,12 @@ struct usb_mixer_elem_list {
         usb_mixer_elem_resume_func_t resume;
 };
 
+/* iterate over mixer element list of the given unit id */
+#define for_each_mixer_elem(list, mixer, id)    \
+        for ((list) = (mixer)->id_elems[id]; (list); (list) = (list)->next_id_elem)
+#define mixer_elem_list_to_info(list) \
+        container_of(list, struct usb_mixer_elem_info, head)
+
 struct usb_mixer_elem_info {
         struct usb_mixer_elem_list head;
         unsigned int control;   /* CS or ICN (high byte) */