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hwmon: (vexpress) Avoid creating non-existing attributes 

The 'label' attribute was always created but returned -ENOENT
if there is no label and such behaviour is undefined from
libsensors' point of view.

Fixed by providing is_visible method in the attributes group,
so the attribute is not created at all when unnecessary.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Pawel Moll 2014-04-23 18:27:05 +01:00 committed by Guenter Roeck
parent 52feaca5d6
commit b2e5411ee2
1 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/hwmon/vexpress.c
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@ -43,9 +43,6 @@ static ssize_t vexpress_hwmon_label_show(struct device *dev,
{
const char *label = of_get_property(dev->of_node, "label", NULL);
if (!label)
return -ENOENT;
return snprintf(buffer, PAGE_SIZE, "%s\n", label);
}
@ -84,6 +81,20 @@ static ssize_t vexpress_hwmon_u64_show(struct device *dev,
to_sensor_dev_attr(dev_attr)->index));
}
static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int index)
{
struct device *dev = kobj_to_dev(kobj);
struct device_attribute *dev_attr = container_of(attr,
struct device_attribute, attr);
if (dev_attr->show == vexpress_hwmon_label_show &&
!of_get_property(dev->of_node, "label", NULL))
return 0;
return attr->mode;
}
static DEVICE_ATTR(name, S_IRUGO, vexpress_hwmon_name_show, NULL);
#define VEXPRESS_HWMON_ATTRS(_name, _label_attr, _input_attr) \
@ -105,6 +116,7 @@ static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, vexpress_hwmon_u32_show,
NULL, 1000);
static VEXPRESS_HWMON_ATTRS(volt, in1_label, in1_input);
static struct attribute_group vexpress_hwmon_group_volt = {
.is_visible = vexpress_hwmon_attr_is_visible,
.attrs = vexpress_hwmon_attrs_volt,
};
static struct vexpress_hwmon_type vexpress_hwmon_volt = {
@ -121,6 +133,7 @@ static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, vexpress_hwmon_u32_show,
NULL, 1000);
static VEXPRESS_HWMON_ATTRS(amp, curr1_label, curr1_input);
static struct attribute_group vexpress_hwmon_group_amp = {
.is_visible = vexpress_hwmon_attr_is_visible,
.attrs = vexpress_hwmon_attrs_amp,
};
static struct vexpress_hwmon_type vexpress_hwmon_amp = {
@ -136,6 +149,7 @@ static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, vexpress_hwmon_u32_show,
NULL, 1000);
static VEXPRESS_HWMON_ATTRS(temp, temp1_label, temp1_input);
static struct attribute_group vexpress_hwmon_group_temp = {
.is_visible = vexpress_hwmon_attr_is_visible,
.attrs = vexpress_hwmon_attrs_temp,
};
static struct vexpress_hwmon_type vexpress_hwmon_temp = {
@ -151,6 +165,7 @@ static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, vexpress_hwmon_u32_show,
NULL, 1);
static VEXPRESS_HWMON_ATTRS(power, power1_label, power1_input);
static struct attribute_group vexpress_hwmon_group_power = {
.is_visible = vexpress_hwmon_attr_is_visible,
.attrs = vexpress_hwmon_attrs_power,
};
static struct vexpress_hwmon_type vexpress_hwmon_power = {
@ -166,6 +181,7 @@ static SENSOR_DEVICE_ATTR(energy1_input, S_IRUGO, vexpress_hwmon_u64_show,
NULL, 1);
static VEXPRESS_HWMON_ATTRS(energy, energy1_label, energy1_input);
static struct attribute_group vexpress_hwmon_group_energy = {
.is_visible = vexpress_hwmon_attr_is_visible,
.attrs = vexpress_hwmon_attrs_energy,
};
static struct vexpress_hwmon_type vexpress_hwmon_energy = {