From: Geliang Tang <geliangtang@163.com>
Date: Mon, 21 Dec 2015 15:55:39 +0000 (+0800)
Subject: ALSA: usb-audio: use list_for_each_entry_continue_reverse
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=f67d71ae8bb18137eb1909a588879b33e06cc4c4;p=deliverable%2Flinux.git

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 8ee14f2365e7..c4dc577ab1bd 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -125,11 +125,9 @@ static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
 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;