[PATCH 4.0 30/72] ALSA: emux: Fix mutex deadlock at unloading

[Greg Kroah-Hartman]

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <ti...@suse.de>

commit 07b0e5d49d227e3950cb13a3e8caf248ef2a310e upstream.

The emux-synth driver has a possible AB/BA mutex deadlock at unloading
the emu10k1 driver:

  snd_emux_free() ->
    snd_emux_detach_seq(): mutex_lock(&emu->register_mutex) ->
      snd_seq_delete_kernel_client() ->
        snd_seq_free_client(): mutex_lock(&register_mutex)

  snd_seq_release() ->
    snd_seq_free_client(): mutex_lock(&register_mutex) ->
      snd_seq_delete_all_ports() ->
        snd_emux_unuse(): mutex_lock(&emu->register_mutex)

Basically snd_emux_detach_seq() doesn't need a protection of
emu->register_mutex as it's already being unregistered.  So, we can
get rid of this for avoiding the deadlock.

Signed-off-by: Takashi Iwai <ti...@suse.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 sound/synth/emux/emux_seq.c |    2 --
 1 file changed, 2 deletions(-)

--- a/sound/synth/emux/emux_seq.c
+++ b/sound/synth/emux/emux_seq.c
@@ -124,12 +124,10 @@ snd_emux_detach_seq(struct snd_emux *emu
        if (emu->voices)
                snd_emux_terminate_all(emu);
                
-       mutex_lock(&emu->register_mutex);
        if (emu->client >= 0) {
                snd_seq_delete_kernel_client(emu->client);
                emu->client = -1;
        }
-       mutex_unlock(&emu->register_mutex);
 }
 
 


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