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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-13 10:50:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-13 10:50:06 -0700
commit2818d0d759bc3d763d834097292006d2da3271df (patch)
tree63b7acf7bf934af867cec6b0be7a0306ec64a887 /sound
parentMerge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi (diff)
parentALSA: seq: Cancel pending autoload work at unbinding device (diff)
downloadlinux-dev-2818d0d759bc3d763d834097292006d2da3271df.tar.xz
linux-dev-2818d0d759bc3d763d834097292006d2da3271df.zip
Merge tag 'sound-fix-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai: "Most of the commits are trivial cleanup patches, while one commit is a significant fix for the race at ALSA sequencer that was spotted by syzkaller" * tag 'sound-fix-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: seq: Cancel pending autoload work at unbinding device ALSA: firewire: Use common error handling code in snd_motu_stream_start_duplex() ALSA: asihpi: Kill BUG_ON() usages ALSA: core: Use %pS printk format for direct addresses ALSA: ymfpci: Use common error handling code in snd_ymfpci_create() ALSA: ymfpci: Use common error handling code in snd_card_ymfpci_probe() ALSA: 6fire: Use common error handling code in usb6fire_chip_probe() ALSA: usx2y: Use common error handling code in submit_urbs() ALSA: us122l: Use common error handling code in us122l_create_card() ALSA: hdspm: Use common error handling code in snd_hdspm_probe() ALSA: rme9652: Use common code in hdsp_get_iobox_version() ALSA: maestro3: Use common error handling code in two functions
Diffstat (limited to 'sound')
-rw-r--r--sound/core/device.c4
-rw-r--r--sound/core/seq_device.c3
-rw-r--r--sound/firewire/motu/motu-stream.c16
-rw-r--r--sound/pci/asihpi/asihpi.c6
-rw-r--r--sound/pci/maestro3.c57
-rw-r--r--sound/pci/rme9652/hdsp.c26
-rw-r--r--sound/pci/rme9652/hdspm.c16
-rw-r--r--sound/pci/ymfpci/ymfpci.c62
-rw-r--r--sound/pci/ymfpci/ymfpci_main.c41
-rw-r--r--sound/usb/6fire/chip.c31
-rw-r--r--sound/usb/usx2y/us122l.c10
-rw-r--r--sound/usb/usx2y/usb_stream.c18
12 files changed, 141 insertions, 149 deletions
diff --git a/sound/core/device.c b/sound/core/device.c
index 8918838b1999..cb0e46f66cc9 100644
--- a/sound/core/device.c
+++ b/sound/core/device.c
@@ -128,7 +128,7 @@ void snd_device_disconnect(struct snd_card *card, void *device_data)
if (dev)
__snd_device_disconnect(dev);
else
- dev_dbg(card->dev, "device disconnect %p (from %pF), not found\n",
+ dev_dbg(card->dev, "device disconnect %p (from %pS), not found\n",
device_data, __builtin_return_address(0));
}
EXPORT_SYMBOL_GPL(snd_device_disconnect);
@@ -152,7 +152,7 @@ void snd_device_free(struct snd_card *card, void *device_data)
if (dev)
__snd_device_free(dev);
else
- dev_dbg(card->dev, "device free %p (from %pF), not found\n",
+ dev_dbg(card->dev, "device free %p (from %pS), not found\n",
device_data, __builtin_return_address(0));
}
EXPORT_SYMBOL(snd_device_free);
diff --git a/sound/core/seq_device.c b/sound/core/seq_device.c
index c4acf17e9f5e..e40a2cba5002 100644
--- a/sound/core/seq_device.c
+++ b/sound/core/seq_device.c
@@ -148,8 +148,10 @@ void snd_seq_device_load_drivers(void)
flush_work(&autoload_work);
}
EXPORT_SYMBOL(snd_seq_device_load_drivers);
+#define cancel_autoload_drivers() cancel_work_sync(&autoload_work)
#else
#define queue_autoload_drivers() /* NOP */
+#define cancel_autoload_drivers() /* NOP */
#endif
/*
@@ -159,6 +161,7 @@ static int snd_seq_device_dev_free(struct snd_device *device)
{
struct snd_seq_device *dev = device->device_data;
+ cancel_autoload_drivers();
put_device(&dev->dev);
return 0;
}
diff --git a/sound/firewire/motu/motu-stream.c b/sound/firewire/motu/motu-stream.c
index dc5541c8b359..73e7a5e527fc 100644
--- a/sound/firewire/motu/motu-stream.c
+++ b/sound/firewire/motu/motu-stream.c
@@ -253,24 +253,21 @@ int snd_motu_stream_start_duplex(struct snd_motu *motu, unsigned int rate)
if (err < 0) {
dev_err(&motu->unit->device,
"fail to start isochronous comm: %d\n", err);
- stop_both_streams(motu);
- return err;
+ goto stop_streams;
}
err = start_isoc_ctx(motu, &motu->rx_stream);
if (err < 0) {
dev_err(&motu->unit->device,
"fail to start IT context: %d\n", err);
- stop_both_streams(motu);
- return err;
+ goto stop_streams;
}
err = protocol->switch_fetching_mode(motu, true);
if (err < 0) {
dev_err(&motu->unit->device,
"fail to enable frame fetching: %d\n", err);
- stop_both_streams(motu);
- return err;
+ goto stop_streams;
}
}
@@ -281,12 +278,15 @@ int snd_motu_stream_start_duplex(struct snd_motu *motu, unsigned int rate)
dev_err(&motu->unit->device,
"fail to start IR context: %d", err);
amdtp_stream_stop(&motu->rx_stream);
- stop_both_streams(motu);
- return err;
+ goto stop_streams;
}
}
return 0;
+
+stop_streams:
+ stop_both_streams(motu);
+ return err;
}
void snd_motu_stream_stop_duplex(struct snd_motu *motu)
diff --git a/sound/pci/asihpi/asihpi.c b/sound/pci/asihpi/asihpi.c
index 976a3d23557e..70d023a85bf5 100644
--- a/sound/pci/asihpi/asihpi.c
+++ b/sound/pci/asihpi/asihpi.c
@@ -558,12 +558,10 @@ static void snd_card_asihpi_pcm_int_start(struct snd_pcm_substream *substream)
struct snd_card_asihpi_pcm *dpcm;
struct snd_card_asihpi *card;
- BUG_ON(!substream);
-
dpcm = (struct snd_card_asihpi_pcm *)substream->runtime->private_data;
card = snd_pcm_substream_chip(substream);
- BUG_ON(in_interrupt());
+ WARN_ON(in_interrupt());
tasklet_disable(&card->t);
card->llmode_streampriv = dpcm;
tasklet_enable(&card->t);
@@ -578,8 +576,6 @@ static void snd_card_asihpi_pcm_int_stop(struct snd_pcm_substream *substream)
struct snd_card_asihpi_pcm *dpcm;
struct snd_card_asihpi *card;
- BUG_ON(!substream);
-
dpcm = (struct snd_card_asihpi_pcm *)substream->runtime->private_data;
card = snd_pcm_substream_chip(substream);
diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c
index 97ac80af4447..8f20dec97843 100644
--- a/sound/pci/maestro3.c
+++ b/sound/pci/maestro3.c
@@ -2622,22 +2622,18 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
err = request_firmware(&chip->assp_kernel_image,
"ess/maestro3_assp_kernel.fw", &pci->dev);
- if (err < 0) {
- snd_m3_free(chip);
- return err;
- }
+ if (err < 0)
+ goto free_chip;
err = request_firmware(&chip->assp_minisrc_image,
"ess/maestro3_assp_minisrc.fw", &pci->dev);
- if (err < 0) {
- snd_m3_free(chip);
- return err;
- }
+ if (err < 0)
+ goto free_chip;
+
+ err = pci_request_regions(pci, card->driver);
+ if (err < 0)
+ goto free_chip;
- if ((err = pci_request_regions(pci, card->driver)) < 0) {
- snd_m3_free(chip);
- return err;
- }
chip->iobase = pci_resource_start(pci, 0);
/* just to be sure */
@@ -2655,8 +2651,8 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
if (request_irq(pci->irq, snd_m3_interrupt, IRQF_SHARED,
KBUILD_MODNAME, chip)) {
dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
- snd_m3_free(chip);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto free_chip;
}
chip->irq = pci->irq;
@@ -2666,10 +2662,9 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
dev_warn(card->dev, "can't allocate apm buffer\n");
#endif
- if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
- snd_m3_free(chip);
- return err;
- }
+ err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
+ if (err < 0)
+ goto free_chip;
if ((err = snd_m3_mixer(chip)) < 0)
return err;
@@ -2699,6 +2694,10 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
*chip_ret = chip;
return 0;
+
+free_chip:
+ snd_m3_free(chip);
+ return err;
}
/*
@@ -2741,23 +2740,19 @@ snd_m3_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)
break;
}
- if ((err = snd_m3_create(card, pci,
- external_amp[dev],
- amp_gpio[dev],
- &chip)) < 0) {
- snd_card_free(card);
- return err;
- }
+ err = snd_m3_create(card, pci, external_amp[dev], amp_gpio[dev], &chip);
+ if (err < 0)
+ goto free_card;
+
card->private_data = chip;
sprintf(card->shortname, "ESS %s PCI", card->driver);
sprintf(card->longname, "%s at 0x%lx, irq %d",
card->shortname, chip->iobase, chip->irq);
- if ((err = snd_card_register(card)) < 0) {
- snd_card_free(card);
- return err;
- }
+ err = snd_card_register(card);
+ if (err < 0)
+ goto free_card;
#if 0 /* TODO: not supported yet */
/* TODO enable MIDI IRQ and I/O */
@@ -2772,6 +2767,10 @@ snd_m3_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)
pci_set_drvdata(pci, card);
dev++;
return 0;
+
+free_card:
+ snd_card_free(card);
+ return err;
}
static void snd_m3_remove(struct pci_dev *pci)
diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index 0ff41f9ab434..9f0f73875f01 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -793,11 +793,8 @@ static int hdsp_get_iobox_version (struct hdsp *hdsp)
hdsp_write(hdsp, HDSP_control2Reg, HDSP_S200 | HDSP_PROGRAM);
hdsp_write (hdsp, HDSP_fifoData, 0);
- if (hdsp_fifo_wait(hdsp, 0, HDSP_SHORT_WAIT) < 0) {
- hdsp->io_type = Multiface;
- dev_info(hdsp->card->dev, "Multiface found\n");
- return 0;
- }
+ if (hdsp_fifo_wait(hdsp, 0, HDSP_SHORT_WAIT) < 0)
+ goto set_multi;
hdsp_write(hdsp, HDSP_control2Reg, HDSP_S_LOAD);
hdsp_write(hdsp, HDSP_fifoData, 0);
@@ -810,20 +807,14 @@ static int hdsp_get_iobox_version (struct hdsp *hdsp)
hdsp_write(hdsp, HDSP_control2Reg, HDSP_S300);
hdsp_write(hdsp, HDSP_control2Reg, HDSP_S_LOAD);
hdsp_write(hdsp, HDSP_fifoData, 0);
- if (hdsp_fifo_wait(hdsp, 0, HDSP_SHORT_WAIT) == 0) {
- hdsp->io_type = Multiface;
- dev_info(hdsp->card->dev, "Multiface found\n");
- return 0;
- }
+ if (hdsp_fifo_wait(hdsp, 0, HDSP_SHORT_WAIT) == 0)
+ goto set_multi;
hdsp_write(hdsp, HDSP_control2Reg, HDSP_S300);
hdsp_write(hdsp, HDSP_control2Reg, HDSP_S_LOAD);
hdsp_write(hdsp, HDSP_fifoData, 0);
- if (hdsp_fifo_wait(hdsp, 0, HDSP_SHORT_WAIT) < 0) {
- hdsp->io_type = Multiface;
- dev_info(hdsp->card->dev, "Multiface found\n");
- return 0;
- }
+ if (hdsp_fifo_wait(hdsp, 0, HDSP_SHORT_WAIT) < 0)
+ goto set_multi;
hdsp->io_type = RPM;
dev_info(hdsp->card->dev, "RPM found\n");
@@ -838,6 +829,11 @@ static int hdsp_get_iobox_version (struct hdsp *hdsp)
hdsp->io_type = Digiface;
}
return 0;
+
+set_multi:
+ hdsp->io_type = Multiface;
+ dev_info(hdsp->card->dev, "Multiface found\n");
+ return 0;
}
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 25284d8d9758..f20d42714e4d 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -6949,10 +6949,8 @@ static int snd_hdspm_probe(struct pci_dev *pci,
hdspm->pci = pci;
err = snd_hdspm_create(card, hdspm);
- if (err < 0) {
- snd_card_free(card);
- return err;
- }
+ if (err < 0)
+ goto free_card;
if (hdspm->io_type != MADIface) {
snprintf(card->shortname, sizeof(card->shortname), "%s_%x",
@@ -6970,15 +6968,17 @@ static int snd_hdspm_probe(struct pci_dev *pci,
}
err = snd_card_register(card);
- if (err < 0) {
- snd_card_free(card);
- return err;
- }
+ if (err < 0)
+ goto free_card;
pci_set_drvdata(pci, card);
dev++;
return 0;
+
+free_card:
+ snd_card_free(card);
+ return err;
}
static void snd_hdspm_remove(struct pci_dev *pci)
diff --git a/sound/pci/ymfpci/ymfpci.c b/sound/pci/ymfpci/ymfpci.c
index 4faf3e1ed06a..eafdee384059 100644
--- a/sound/pci/ymfpci/ymfpci.c
+++ b/sound/pci/ymfpci/ymfpci.c
@@ -268,10 +268,9 @@ static int snd_card_ymfpci_probe(struct pci_dev *pci,
if ((err = snd_ymfpci_create(card, pci,
old_legacy_ctrl,
&chip)) < 0) {
- snd_card_free(card);
release_and_free_resource(mpu_res);
release_and_free_resource(fm_res);
- return err;
+ goto free_card;
}
chip->fm_res = fm_res;
chip->mpu_res = mpu_res;
@@ -283,35 +282,31 @@ static int snd_card_ymfpci_probe(struct pci_dev *pci,
card->shortname,
chip->reg_area_phys,
chip->irq);
- if ((err = snd_ymfpci_pcm(chip, 0)) < 0) {
- snd_card_free(card);
- return err;
- }
- if ((err = snd_ymfpci_pcm_spdif(chip, 1)) < 0) {
- snd_card_free(card);
- return err;
- }
+ err = snd_ymfpci_pcm(chip, 0);
+ if (err < 0)
+ goto free_card;
+
+ err = snd_ymfpci_pcm_spdif(chip, 1);
+ if (err < 0)
+ goto free_card;
+
err = snd_ymfpci_mixer(chip, rear_switch[dev]);
- if (err < 0) {
- snd_card_free(card);
- return err;
- }
+ if (err < 0)
+ goto free_card;
+
if (chip->ac97->ext_id & AC97_EI_SDAC) {
err = snd_ymfpci_pcm_4ch(chip, 2);
- if (err < 0) {
- snd_card_free(card);
- return err;
- }
+ if (err < 0)
+ goto free_card;
+
err = snd_ymfpci_pcm2(chip, 3);
- if (err < 0) {
- snd_card_free(card);
- return err;
- }
- }
- if ((err = snd_ymfpci_timer(chip, 0)) < 0) {
- snd_card_free(card);
- return err;
+ if (err < 0)
+ goto free_card;
}
+ err = snd_ymfpci_timer(chip, 0);
+ if (err < 0)
+ goto free_card;
+
if (chip->mpu_res) {
if ((err = snd_mpu401_uart_new(card, 0, MPU401_HW_YMFPCI,
mpu_port[dev],
@@ -336,21 +331,24 @@ static int snd_card_ymfpci_probe(struct pci_dev *pci,
legacy_ctrl &= ~YMFPCI_LEGACY_FMEN;
pci_write_config_word(pci, PCIR_DSXG_LEGACY, legacy_ctrl);
} else if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
- snd_card_free(card);
dev_err(card->dev, "cannot create opl3 hwdep\n");
- return err;
+ goto free_card;
}
}
snd_ymfpci_create_gameport(chip, dev, legacy_ctrl, legacy_ctrl2);
- if ((err = snd_card_register(card)) < 0) {
- snd_card_free(card);
- return err;
- }
+ err = snd_card_register(card);
+ if (err < 0)
+ goto free_card;
+
pci_set_drvdata(pci, card);
dev++;
return 0;
+
+free_card:
+ snd_card_free(card);
+ return err;
}
static void snd_card_ymfpci_remove(struct pci_dev *pci)
diff --git a/sound/pci/ymfpci/ymfpci_main.c b/sound/pci/ymfpci/ymfpci_main.c
index edfd58248082..8ca2e41e5827 100644
--- a/sound/pci/ymfpci/ymfpci_main.c
+++ b/sound/pci/ymfpci/ymfpci_main.c
@@ -2399,59 +2399,60 @@ int snd_ymfpci_create(struct snd_card *card,
dev_err(chip->card->dev,
"unable to grab memory region 0x%lx-0x%lx\n",
chip->reg_area_phys, chip->reg_area_phys + 0x8000 - 1);
- snd_ymfpci_free(chip);
- return -EBUSY;
+ err = -EBUSY;
+ goto free_chip;
}
if (request_irq(pci->irq, snd_ymfpci_interrupt, IRQF_SHARED,
KBUILD_MODNAME, chip)) {
dev_err(chip->card->dev, "unable to grab IRQ %d\n", pci->irq);
- snd_ymfpci_free(chip);
- return -EBUSY;
+ err = -EBUSY;
+ goto free_chip;
}
chip->irq = pci->irq;
snd_ymfpci_aclink_reset(pci);
if (snd_ymfpci_codec_ready(chip, 0) < 0) {
- snd_ymfpci_free(chip);
- return -EIO;
+ err = -EIO;
+ goto free_chip;
}
err = snd_ymfpci_request_firmware(chip);
if (err < 0) {
dev_err(chip->card->dev, "firmware request failed: %d\n", err);
- snd_ymfpci_free(chip);
- return err;
+ goto free_chip;
}
snd_ymfpci_download_image(chip);
udelay(100); /* seems we need a delay after downloading image.. */
if (snd_ymfpci_memalloc(chip) < 0) {
- snd_ymfpci_free(chip);
- return -EIO;
+ err = -EIO;
+ goto free_chip;
}
- if ((err = snd_ymfpci_ac3_init(chip)) < 0) {
- snd_ymfpci_free(chip);
- return err;
- }
+ err = snd_ymfpci_ac3_init(chip);
+ if (err < 0)
+ goto free_chip;
#ifdef CONFIG_PM_SLEEP
chip->saved_regs = kmalloc(YDSXGR_NUM_SAVED_REGS * sizeof(u32),
GFP_KERNEL);
if (chip->saved_regs == NULL) {
- snd_ymfpci_free(chip);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto free_chip;
}
#endif
- if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
- snd_ymfpci_free(chip);
- return err;
- }
+ err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
+ if (err < 0)
+ goto free_chip;
snd_ymfpci_proc_init(card, chip);
*rchip = chip;
return 0;
+
+free_chip:
+ snd_ymfpci_free(chip);
+ return err;
}
diff --git a/sound/usb/6fire/chip.c b/sound/usb/6fire/chip.c
index bc2a24f7a791..c7641cb50616 100644
--- a/sound/usb/6fire/chip.c
+++ b/sound/usb/6fire/chip.c
@@ -143,37 +143,32 @@ static int usb6fire_chip_probe(struct usb_interface *intf,
chip->card = card;
ret = usb6fire_comm_init(chip);
- if (ret < 0) {
- usb6fire_chip_destroy(chip);
- return ret;
- }
+ if (ret < 0)
+ goto destroy_chip;
ret = usb6fire_midi_init(chip);
- if (ret < 0) {
- usb6fire_chip_destroy(chip);
- return ret;
- }
+ if (ret < 0)
+ goto destroy_chip;
ret = usb6fire_pcm_init(chip);
- if (ret < 0) {
- usb6fire_chip_destroy(chip);
- return ret;
- }
+ if (ret < 0)
+ goto destroy_chip;
ret = usb6fire_control_init(chip);
- if (ret < 0) {
- usb6fire_chip_destroy(chip);
- return ret;
- }
+ if (ret < 0)
+ goto destroy_chip;
ret = snd_card_register(card);
if (ret < 0) {
dev_err(&intf->dev, "cannot register card.");
- usb6fire_chip_destroy(chip);
- return ret;
+ goto destroy_chip;
}
usb_set_intfdata(intf, chip);
return 0;
+
+destroy_chip:
+ usb6fire_chip_destroy(chip);
+ return ret;
}
static void usb6fire_chip_disconnect(struct usb_interface *intf)
diff --git a/sound/usb/usx2y/us122l.c b/sound/usb/usx2y/us122l.c
index b49d6e953d52..159da1f3924e 100644
--- a/sound/usb/usx2y/us122l.c
+++ b/sound/usb/usx2y/us122l.c
@@ -508,8 +508,7 @@ static bool us122l_create_card(struct snd_card *card)
err = us122l_create_usbmidi(card);
if (err < 0) {
snd_printk(KERN_ERR "us122l_create_usbmidi error %i \n", err);
- us122l_stop(us122l);
- return false;
+ goto stop;
}
err = usb_stream_hwdep_new(card);
if (err < 0) {
@@ -518,10 +517,13 @@ static bool us122l_create_card(struct snd_card *card)
list_for_each(p, &us122l->midi_list)
snd_usbmidi_disconnect(p);
- us122l_stop(us122l);
- return false;
+ goto stop;
}
return true;
+
+stop:
+ us122l_stop(us122l);
+ return false;
}
static void snd_us122l_free(struct snd_card *card)
diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c
index fe926cb9192e..4dab49080700 100644
--- a/sound/usb/usx2y/usb_stream.c
+++ b/sound/usb/usx2y/usb_stream.c
@@ -352,20 +352,22 @@ static int submit_urbs(struct usb_stream_kernel *sk,
int err;
prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb);
err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC);
- if (err < 0) {
- snd_printk(KERN_ERR "%i\n", err);
- return err;
- }
+ if (err < 0)
+ goto report_failure;
+
sk->idle_inurb = sk->completed_inurb;
sk->completed_inurb = inurb;
err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC);
- if (err < 0) {
- snd_printk(KERN_ERR "%i\n", err);
- return err;
- }
+ if (err < 0)
+ goto report_failure;
+
sk->idle_outurb = sk->completed_outurb;
sk->completed_outurb = outurb;
return 0;
+
+report_failure:
+ snd_printk(KERN_ERR "%i\n", err);
+ return err;
}
#ifdef DEBUG_LOOP_BACK