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ALSA: line6: Create sysfs via snd_card_add_dev_attr() 

Use the new helper function to create sysfs entries in the card more
gracefully without races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-30 12:36:17 +01:00
parent 6bbc7fed84
commit 02fc76f6a7
1 changed files with 13 additions and 25 deletions
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38
sound/usb/line6/pod.c
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@ -330,6 +330,18 @@ static DEVICE_ATTR_RO(device_id);
static DEVICE_ATTR_RO(firmware_version);
static DEVICE_ATTR_RO(serial_number);
static struct attribute *pod_dev_attrs[] = {
&dev_attr_device_id.attr,
&dev_attr_firmware_version.attr,
&dev_attr_serial_number.attr,
NULL
};
static const struct attribute_group pod_dev_attr_group = {
.name = "pod",
.attrs = pod_dev_attrs,
};
/* control info callback */
static int snd_pod_control_monitor_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
@ -387,34 +399,10 @@ static void line6_pod_disconnect(struct usb_line6 *line6)
struct usb_line6_pod *pod = (struct usb_line6_pod *)line6;
struct device *dev = line6->ifcdev;
/* remove sysfs entries: */
device_remove_file(dev, &dev_attr_device_id);
device_remove_file(dev, &dev_attr_firmware_version);
device_remove_file(dev, &dev_attr_serial_number);
del_timer_sync(&pod->startup_timer);
cancel_work_sync(&pod->startup_work);
}
/*
Create sysfs entries.
*/
static int pod_create_files2(struct device *dev)
{
int err;
err = device_create_file(dev, &dev_attr_device_id);
if (err < 0)
return err;
err = device_create_file(dev, &dev_attr_firmware_version);
if (err < 0)
return err;
err = device_create_file(dev, &dev_attr_serial_number);
if (err < 0)
return err;
return 0;
}
/*
Try to init POD device.
*/
@ -431,7 +419,7 @@ static int pod_init(struct usb_line6 *line6,
INIT_WORK(&pod->startup_work, pod_startup4);
/* create sysfs entries: */
err = pod_create_files2(line6->ifcdev);
err = snd_card_add_dev_attr(line6->card, &pod_dev_attr_group);
if (err < 0)
return err;