[alsa-devel] [PATCH] ALSA: core: Fix missing card sysfs contents

[Takashi Iwai]

While moving the card device into struct snd_card, the reference to
the assigned card in sysfs show/store callbacks were forgotten to be
refreshed, still accessing to the no longer used drvdata.  Fix these
places to refer correctly via container_of().

Also, remove the superfluous NULL checks since it's guaranteed to be
non-NULL now.

Fixes: 8bfb181c17d2 ('ALSA: Embed card device into struct snd_card')
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/core/init.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/sound/core/init.c b/sound/core/init.c
index 0095a530ff12..b7085eb19079 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -624,15 +624,15 @@ static ssize_t
 card_id_show_attr(struct device *dev,
 		  struct device_attribute *attr, char *buf)
 {
-	struct snd_card *card = dev_get_drvdata(dev);
-	return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)");
+	struct snd_card *card = container_of(dev, struct snd_card, card_dev);
+	return snprintf(buf, PAGE_SIZE, "%s\n", card->id);
 }
 
 static ssize_t
 card_id_store_attr(struct device *dev, struct device_attribute *attr,
 		   const char *buf, size_t count)
 {
-	struct snd_card *card = dev_get_drvdata(dev);
+	struct snd_card *card = container_of(dev, struct snd_card, card_dev);
 	char buf1[sizeof(card->id)];
 	size_t copy = count > sizeof(card->id) - 1 ?
 					sizeof(card->id) - 1 : count;
@@ -664,8 +664,8 @@ static ssize_t
 card_number_show_attr(struct device *dev,
 		     struct device_attribute *attr, char *buf)
 {
-	struct snd_card *card = dev_get_drvdata(dev);
-	return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
+	struct snd_card *card = container_of(dev, struct snd_card, card_dev);
+	return snprintf(buf, PAGE_SIZE, "%i\n", card->number);
 }
 
 static DEVICE_ATTR(number, S_IRUGO, card_number_show_attr, NULL);
-- 
1.8.5.2