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ALSA: hda - Use own workqueue

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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>
This commit is contained in:
Takashi Iwai
2009-01-12 10:09:24 +01:00
parent 4b55899104
commit 6acaed38a3
4 changed files with 21 additions and 10 deletions
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23
sound/pci/hda/hda_codec.c
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@@ -373,7 +373,7 @@ int snd_hda_queue_unsol_event(struct hda_bus *bus, u32 res, u32 res_ex)
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 @@ static int snd_hda_bus_free(struct hda_bus *bus)
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 @@ int /*__devinit*/ snd_hda_bus_new(struct snd_card *card,
{
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 @@ int /*__devinit*/ snd_hda_bus_new(struct snd_card *card,
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 @@ static void snd_hda_codec_free(struct hda_codec *codec)
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 @@ void snd_hda_codec_reset(struct hda_codec *codec)
#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 */