From f3f7c1837f6bcae3601fc535b339426868bf1549 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Wed, 11 May 2011 11:07:09 +0200 Subject: [PATCH 9/9] ALSA: isight: fix locking 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 Reported-by: Stefan Richter Signed-off-by: Takashi Iwai --- sound/firewire/isight.c | 9 ++++++--- 1 files changed, 6 insertions(+), 3 deletions(-) diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c index 9626743..86ee16c 100644 --- a/sound/firewire/isight.c +++ b/sound/firewire/isight.c @@ -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[] = { -- 1.7.3.4