From: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Date: Thu, 16 Sep 2010 07:26:54 +0000 (+0300)
Subject: ALSA: core: Allow card id change to the same string
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4437ecdc7190302ed02fb1467c116aff29c325b2;p=linux-beck.git

ALSA: core: Allow card id change to the same string

When user want to change the card id to the same string
on the card via /sys/class/sound/cardX/id, do not
report error. Instead return with success without
doing anything.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/core/init.c b/sound/core/init.c
index ec4a50ce5656..2de45fbd70fb 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -607,11 +607,16 @@ card_id_store_attr(struct device *dev, struct device_attribute *attr,
 		return -EEXIST;
 	}
 	for (idx = 0; idx < snd_ecards_limit; idx++) {
-		if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1))
-			goto __exist;
+		if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) {
+			if (card == snd_cards[idx])
+				goto __ok;
+			else
+				goto __exist;
+		}
 	}
 	strcpy(card->id, buf1);
 	snd_info_card_id_change(card);
+__ok:
 	mutex_unlock(&snd_card_mutex);
 
 	return count;