ALSA: seq-oss: Initialize MIDI clients asynchronously

[cascardo/linux.git] / sound / core / seq / oss / seq_oss_init.c

diff --git a/sound/core/seq/oss/seq_oss_init.c b/sound/core/seq/oss/seq_oss_init.c
index e3cb46f..b3f39b5 100644 (file)
--- a/sound/core/seq/oss/seq_oss_init.c
+++ b/sound/core/seq/oss/seq_oss_init.c
@@ -31,6 +31,7 @@
 #include <linux/export.h>
 #include <linux/moduleparam.h>
 #include <linux/slab.h>
+#include <linux/workqueue.h>
 
 /*
  * common variables
@@ -60,6 +61,14 @@ static void free_devinfo(void *private);
 #define call_ctl(type,rec) snd_seq_kernel_client_ctl(system_client, type, rec)
 
 
+/* call snd_seq_oss_midi_lookup_ports() asynchronously */
+static void async_call_lookup_ports(struct work_struct *work)
+{
+       snd_seq_oss_midi_lookup_ports(system_client);
+}
+
+static DECLARE_WORK(async_lookup_work, async_call_lookup_ports);
+
 /*
  * create sequencer client for OSS sequencer
  */
@@ -85,9 +94,6 @@ snd_seq_oss_create_client(void)
        system_client = rc;
        debug_printk(("new client = %d\n", rc));
 
-       /* look up midi devices */
-       snd_seq_oss_midi_lookup_ports(system_client);
-
        /* create annoucement receiver port */
        memset(port, 0, sizeof(*port));
        strcpy(port->name, "Receiver");
@@ -115,6 +121,9 @@ snd_seq_oss_create_client(void)
        }
        rc = 0;
 
+       /* look up midi devices */
+       schedule_work(&async_lookup_work);
+
  __error:
        kfree(port);
        return rc;
@@ -160,6 +169,7 @@ receive_announce(struct snd_seq_event *ev, int direct, void *private, int atomic
 int
 snd_seq_oss_delete_client(void)
 {
+       cancel_work_sync(&async_lookup_work);
        if (system_client >= 0)
                snd_seq_delete_kernel_client(system_client);