ALSA: usb-audio: use list_for_each_entry_continue_reverse
For better readability, use list_for_each_entry_continue_reverse()
in have_dup_chmap().
Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 8ee14f2..c4dc577 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -125,11 +125,9 @@
static bool have_dup_chmap(struct snd_usb_substream *subs,
struct audioformat *fp)
{
- struct list_head *p;
+ struct audioformat *prev = fp;
- for (p = fp->list.prev; p != &subs->fmt_list; p = p->prev) {
- struct audioformat *prev;
- prev = list_entry(p, struct audioformat, list);
+ list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
if (prev->chmap &&
!memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
return true;