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ALSA: line6: Create sysfs via snd_card_add_dev_attr()
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Use the new helper function to create sysfs entries in the card more
gracefully without races.

Signed-off-by: Takashi Iwai <[email protected]>
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tiwai committed Feb 6, 2015
1 parent 6bbc7fe commit 02fc76f
Showing 1 changed file with 13 additions and 25 deletions.
38 changes: 13 additions & 25 deletions sound/usb/line6/pod.c
Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand Down Expand Up @@ -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.
*/
Expand All @@ -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;

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