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authorTakashi Iwai <tiwai@suse.de>2013-11-14 15:35:46 +0100
committerTakashi Iwai <tiwai@suse.de>2013-11-14 17:22:45 +0100
commit32b8544296b944b204b33f9837701d4d0b9adefe (patch)
tree307ee25de70ac19e9fa93d2e231088c12ce583ef /sound/core
parent6408eac2665955343cd0e4bcd7d6237ce39611ed (diff)
ALSA: jack: Unregister input device at disconnection
The recent change in sysfs triggered a kernel WARNING at unloading a sound driver like WARNING: CPU: 3 PID: 2247 at fs/sysfs/group.c:214 sysfs_remove_group+0xe8/0xf0() sysfs group ffffffff81ab7b20 not found for kobject 'event14' for each jack instance. It's because the unregistration of jack input device is done in dev_free callback, which is called after snd_card_disconnect(). Since device_unregister(card->card_dev) is called in snd_card_disconnect(), the whole sysfs entries belonging to card->card_dev have been already removed recursively. Thus this results in a warning as input_unregister_device() yet tries to unregister the already removed sysfs entry. For fixing this mess, we need to unregister the jack input device at dev_disconnect callback so that it's called before unregistering the card->card_dev. Reviwed-by: Mark Brown <broonie@linaro.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/jack.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/sound/core/jack.c b/sound/core/jack.c
index b35fe7345c20..8658578eb584 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -34,12 +34,12 @@ static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
SW_LINEIN_INSERT,
};
-static int snd_jack_dev_free(struct snd_device *device)
+static int snd_jack_dev_disconnect(struct snd_device *device)
{
struct snd_jack *jack = device->device_data;
- if (jack->private_free)
- jack->private_free(jack);
+ if (!jack->input_dev)
+ return 0;
/* If the input device is registered with the input subsystem
* then we need to use a different deallocator. */
@@ -47,6 +47,18 @@ static int snd_jack_dev_free(struct snd_device *device)
input_unregister_device(jack->input_dev);
else
input_free_device(jack->input_dev);
+ jack->input_dev = NULL;
+ return 0;
+}
+
+static int snd_jack_dev_free(struct snd_device *device)
+{
+ struct snd_jack *jack = device->device_data;
+
+ if (jack->private_free)
+ jack->private_free(jack);
+
+ snd_jack_dev_disconnect(device);
kfree(jack->id);
kfree(jack);
@@ -110,6 +122,7 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
static struct snd_device_ops ops = {
.dev_free = snd_jack_dev_free,
.dev_register = snd_jack_dev_register,
+ .dev_disconnect = snd_jack_dev_disconnect,
};
jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);