ALSA: hda - Use own workqueue
snd-hda-intel driver used schedule_work() fot the delayed DMA pointer
updates, but this has several potential problems:
- it may block other eventsd works longer
- it may deadlock when probing fails and flush_scheduled_work() is
called during probe callback (as probe callback itself could be
invoked from eventd)
This patch adds an own workq for each driver instance to solve these
problems.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c
index e00421c..960fd79 100644
--- a/sound/pci/hda/hda_beep.c
+++ b/sound/pci/hda/hda_beep.c
@@ -135,7 +135,6 @@
struct hda_beep *beep = codec->beep;
if (beep) {
cancel_work_sync(&beep->beep_work);
- flush_scheduled_work();
input_unregister_device(beep->dev);
kfree(beep);
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index f80e5f3..3c596da 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -373,7 +373,7 @@
unsol->queue[wp] = res;
unsol->queue[wp + 1] = res_ex;
- schedule_work(&unsol->work);
+ queue_work(bus->workq, &unsol->work);
return 0;
}
@@ -437,15 +437,17 @@
if (!bus)
return 0;
- if (bus->unsol) {
- flush_scheduled_work();
+ if (bus->workq)
+ flush_workqueue(bus->workq);
+ if (bus->unsol)
kfree(bus->unsol);
- }
list_for_each_entry_safe(codec, n, &bus->codec_list, list) {
snd_hda_codec_free(codec);
}
if (bus->ops.private_free)
bus->ops.private_free(bus);
+ if (bus->workq)
+ destroy_workqueue(bus->workq);
kfree(bus);
return 0;
}
@@ -485,6 +487,7 @@
{
struct hda_bus *bus;
int err;
+ char qname[8];
static struct snd_device_ops dev_ops = {
.dev_register = snd_hda_bus_dev_register,
.dev_free = snd_hda_bus_dev_free,
@@ -514,6 +517,14 @@
mutex_init(&bus->cmd_mutex);
INIT_LIST_HEAD(&bus->codec_list);
+ snprintf(qname, sizeof(qname), "hda%d", card->number);
+ bus->workq = create_workqueue(qname);
+ if (!bus->workq) {
+ snd_printk(KERN_ERR "cannot create workqueue %s\n", qname);
+ kfree(bus);
+ return -ENOMEM;
+ }
+
err = snd_device_new(card, SNDRV_DEV_BUS, bus, &dev_ops);
if (err < 0) {
snd_hda_bus_free(bus);
@@ -684,7 +695,7 @@
return;
#ifdef CONFIG_SND_HDA_POWER_SAVE
cancel_delayed_work(&codec->power_work);
- flush_scheduled_work();
+ flush_workqueue(codec->bus->workq);
#endif
list_del(&codec->list);
snd_array_free(&codec->mixers);
@@ -1273,7 +1284,7 @@
#ifdef CONFIG_SND_HDA_POWER_SAVE
cancel_delayed_work(&codec->power_work);
- flush_scheduled_work();
+ flush_workqueue(codec->bus->workq);
#endif
snd_hda_ctls_clear(codec);
/* relase PCMs */
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index e9c723e..5810ef5 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -614,6 +614,7 @@
/* unsolicited event queue */
struct hda_bus_unsolicited *unsol;
+ struct workqueue_struct *workq; /* common workqueue for codecs */
/* assigned PCMs */
DECLARE_BITMAP(pcm_dev_bits, SNDRV_PCM_DEVICES);
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index f04de11..11e791b 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -996,10 +996,11 @@
spin_unlock(&chip->reg_lock);
snd_pcm_period_elapsed(azx_dev->substream);
spin_lock(&chip->reg_lock);
- } else {
+ } else if (chip->bus && chip->bus->workq) {
/* bogus IRQ, process it later */
azx_dev->irq_pending = 1;
- schedule_work(&chip->irq_pending_work);
+ queue_work(chip->bus->workq,
+ &chip->irq_pending_work);
}
}
}
@@ -1741,7 +1742,6 @@
for (i = 0; i < chip->num_streams; i++)
chip->azx_dev[i].irq_pending = 0;
spin_unlock_irq(&chip->reg_lock);
- flush_scheduled_work();
}
static struct snd_pcm_ops azx_pcm_ops = {