[alsa-devel] [PATCH] ALSA: core: Allow card id change to the same string

[Peter Ujfalusi]

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 at nokia.com>
---
 sound/core/init.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/sound/core/init.c b/sound/core/init.c
index ec4a50c..2de45fb 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;
-- 
1.7.2.2