ALSA: seq-dummy: remove deadlock-causing events on close

When the last subscriber to a "Through" port has been removed, the
subscribed destination ports might still be active, so it would be
wrong to send "all sounds off" and "reset controller" events to them.
The proper place for such a shutdown would be the closing of the actual
MIDI port (and close_substream() in rawmidi.c already can do this).

This also fixes a deadlock when dummy_unuse() tries to send events to
its own port that is already locked because it is being freed.

Reported-by: Peter Billam <peter@www.pjb.com.au>
Cc: <stable@vger.kernel.org>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/seq/seq_dummy.c b/sound/core/seq/seq_dummy.c
index ec667f158f192c4467e020164ecd4adf30a5ce04..5d905d90d504c0d588b62bb856e7314e23488ec0 100644 (file)
--- a/sound/core/seq/seq_dummy.c
+++ b/sound/core/seq/seq_dummy.c
@@ -81,36 +81,6 @@ struct snd_seq_dummy_port {
 
 static int my_client = -1;
 
-/*
- * unuse callback - send ALL_SOUNDS_OFF and RESET_CONTROLLERS events
- * to subscribers.
- * Note: this callback is called only after all subscribers are removed.
- */
-static int
-dummy_unuse(void *private_data, struct snd_seq_port_subscribe *info)
-{
-       struct snd_seq_dummy_port *p;
-       int i;
-       struct snd_seq_event ev;
-
-       p = private_data;
-       memset(&ev, 0, sizeof(ev));
-       if (p->duplex)
-               ev.source.port = p->connect;
-       else
-               ev.source.port = p->port;
-       ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
-       ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
-       for (i = 0; i < 16; i++) {
-               ev.data.control.channel = i;
-               ev.data.control.param = MIDI_CTL_ALL_SOUNDS_OFF;
-               snd_seq_kernel_client_dispatch(p->client, &ev, 0, 0);
-               ev.data.control.param = MIDI_CTL_RESET_CONTROLLERS;
-               snd_seq_kernel_client_dispatch(p->client, &ev, 0, 0);
-       }
-       return 0;
-}
-
 /*
  * event input callback - just redirect events to subscribers
  */
@@ -175,7 +145,6 @@ create_port(int idx, int type)
                | SNDRV_SEQ_PORT_TYPE_PORT;
        memset(&pcb, 0, sizeof(pcb));
        pcb.owner = THIS_MODULE;
-       pcb.unuse = dummy_unuse;
        pcb.event_input = dummy_input;
        pcb.private_free = dummy_free;
        pcb.private_data = rec;