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ALSA: isight: fix locking

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Lockdep complains about conflicts between isight->mutex,
ALSA's register_mutex, mm->mmap_sem, and pcm->open_mutex.

This can be fixed by moving the calls to isight_pcm_abort(),
snd_card_disconnect(), and fw_iso_resources_update() out of
isight->mutex.  These functions are designed to be called
asynchronously; the mutex needs to protect only the device
streaming state modified by isight_start/stop_streaming().

Signed-off-by: Clemens Ladisch <[email protected]>
Reported-by: Stefan Richter <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Clemens Ladisch 2011-05-11 11:07:09 +02:00 • committed by Takashi Iwai
commit f3f7c1837f
1 changed files with 6 additions and 3 deletions
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9
sound/firewire/isight.c
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@ -692,9 +692,11 @@ static int isight_remove(struct device *dev)
{
struct isight *isight = dev_get_drvdata(dev);
mutex_lock(&isight->mutex);
isight_pcm_abort(isight);
snd_card_disconnect(isight->card);
mutex_lock(&isight->mutex);
isight_stop_streaming(isight);
mutex_unlock(&isight->mutex);
@ -707,12 +709,13 @@ static void isight_bus_reset(struct fw_unit *unit)
{
struct isight *isight = dev_get_drvdata(&unit->device);
mutex_lock(&isight->mutex);
if (fw_iso_resources_update(&isight->resources) < 0) {
isight_pcm_abort(isight);
mutex_lock(&isight->mutex);
isight_stop_streaming(isight);
mutex_unlock(&isight->mutex);
}
mutex_unlock(&isight->mutex);
}
static const struct ieee1394_device_id isight_id_table[] = {