ALSA: firewire-speakers: fix locking

There is a lock inversion between fwspk->mutex and pcm->open_mutex
reported by lockdep when fwspk_hw_free is called.

Fixed by copying the fix from the same former issue in the isight
sound driver (commit f3f7c1837f6bcae3601fc535b339426868bf1549
"ALSA: isight: fix locking").

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/sound/firewire/speakers.c b/sound/firewire/speakers.c
index 3fc257da180c..cbe6bb9e53b6 100644
--- a/sound/firewire/speakers.c
+++ b/sound/firewire/speakers.c
@@ -778,9 +778,10 @@ static int __devexit fwspk_remove(struct device *dev)
 {
         struct fwspk *fwspk = dev_get_drvdata(dev);
 
-        mutex_lock(&fwspk->mutex);
         amdtp_out_stream_pcm_abort(&fwspk->stream);
         snd_card_disconnect(fwspk->card);
+
+        mutex_lock(&fwspk->mutex);
         fwspk_stop_stream(fwspk);
         mutex_unlock(&fwspk->mutex);
 
@@ -796,8 +797,8 @@ static void fwspk_bus_reset(struct fw_unit *unit)
         fcp_bus_reset(fwspk->unit);
 
         if (cmp_connection_update(&fwspk->connection) < 0) {
-                mutex_lock(&fwspk->mutex);
                 amdtp_out_stream_pcm_abort(&fwspk->stream);
+                mutex_lock(&fwspk->mutex);
                 fwspk_stop_stream(fwspk);
                 mutex_unlock(&fwspk->mutex);
                 return;