ALSA: seq: Fix double port list deletion
[pandora-kernel.git] / sound / core / seq / seq_ports.c
index 67c91d2..ee0522a 100644 (file)
@@ -540,19 +540,22 @@ static void delete_and_unsubscribe_port(struct snd_seq_client *client,
                                        bool is_src, bool ack)
 {
        struct snd_seq_port_subs_info *grp;
+       struct list_head *list;
+       bool empty;
 
        grp = is_src ? &port->c_src : &port->c_dest;
+       list = is_src ? &subs->src_list : &subs->dest_list;
        down_write(&grp->list_mutex);
        write_lock_irq(&grp->list_lock);
-       if (is_src)
-               list_del(&subs->src_list);
-       else
-               list_del(&subs->dest_list);
+       empty = list_empty(list);
+       if (!empty)
+               list_del_init(list);
        grp->exclusive = 0;
        write_unlock_irq(&grp->list_lock);
        up_write(&grp->list_mutex);
 
-       unsubscribe_port(client, port, grp, &subs->info, ack);
+       if (!empty)
+               unsubscribe_port(client, port, grp, &subs->info, ack);
 }
 
 /* connect two ports */