[PATCH 1/2] drm/radeon/dpm: Convert to use devm_hwmon_register_with_groups

Guenter Roeck
2013-11-23T05:52:10Z

Simplify the code and fix race condition seen because
attribute files were created after hwmon device registration.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
Compile tested only; unfortunately I don't have the the necessary hardware.

drivers/gpu/drm/radeon/radeon_pm.c | 49 +++++++++---------------------------
1 file changed, 12 insertions(+), 37 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index d1385cc..dc75bb6 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -537,8 +537,7 @@ static ssize_t radeon_hwmon_show_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct drm_device *ddev = dev_get_drvdata(dev);
- struct radeon_device *rdev = ddev->dev_private;
+ struct radeon_device *rdev = dev_get_drvdata(dev);
int temp;

if (rdev->asic->pm.get_temperature)
@@ -566,23 +565,14 @@ static ssize_t radeon_hwmon_show_temp_thresh(struct device *dev,
return snprintf(buf, PAGE_SIZE, "%d\n", temp);
}

-static ssize_t radeon_hwmon_show_name(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "radeon\n");
-}
-
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, radeon_hwmon_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, radeon_hwmon_show_temp_thresh, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, radeon_hwmon_show_temp_thresh, NULL, 1);
-static SENSOR_DEVICE_ATTR(name, S_IRUGO, radeon_hwmon_show_name, NULL, 0);

static struct attribute *hwmon_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
- &sensor_dev_attr_name.dev_attr.attr,
NULL
};

@@ -607,11 +597,15 @@ static const struct attribute_group hwmon_attrgroup = {
.is_visible = hwmon_attributes_visible,
};

+static const struct attribute_group *hwmon_groups[] = {
+ &hwmon_attrgroup,
+ NULL
+};
+
static int radeon_hwmon_init(struct radeon_device *rdev)
{
int err = 0;
-
- rdev->pm.int_hwmon_dev = NULL;
+ struct device *hwmon_dev;

switch (rdev->pm.int_thermal_type) {
case THERMAL_TYPE_RV6XX:
@@ -624,20 +618,13 @@ static int radeon_hwmon_init(struct radeon_device *rdev)
case THERMAL_TYPE_KV:
if (rdev->asic->pm.get_temperature == NULL)
return err;
- rdev->pm.int_hwmon_dev = hwmon_device_register(rdev->dev);
- if (IS_ERR(rdev->pm.int_hwmon_dev)) {
- err = PTR_ERR(rdev->pm.int_hwmon_dev);
+ hwmon_dev = hwmon_device_register_with_groups(rdev->dev,
+ "radeon", rdev,
+ hwmon_groups);
+ if (IS_ERR(hwmon_dev)) {
+ err = PTR_ERR(hwmon_dev);
dev_err(rdev->dev,
"Unable to register hwmon device: %d\n", err);
- break;
- }
- dev_set_drvdata(rdev->pm.int_hwmon_dev, rdev->ddev);
- err = sysfs_create_group(&rdev->pm.int_hwmon_dev->kobj,
- &hwmon_attrgroup);
- if (err) {
- dev_err(rdev->dev,
- "Unable to create hwmon sysfs file: %d\n", err);
- hwmon_device_unregister(rdev->dev);
}
break;
default:
@@ -647,14 +634,6 @@ static int radeon_hwmon_init(struct radeon_device *rdev)
return err;
}

-static void radeon_hwmon_fini(struct radeon_device *rdev)
-{
- if (rdev->pm.int_hwmon_dev) {
- sysfs_remove_group(&rdev->pm.int_hwmon_dev->kobj, &hwmon_attrgroup);
- hwmon_device_unregister(rdev->pm.int_hwmon_dev);
- }
-}
-
static void radeon_dpm_thermal_work_handler(struct work_struct *work)
{
struct radeon_device *rdev =
@@ -1337,8 +1316,6 @@ static void radeon_pm_fini_old(struct radeon_device *rdev)

if (rdev->pm.power_state)
kfree(rdev->pm.power_state);
-
- radeon_hwmon_fini(rdev);
}

static void radeon_pm_fini_dpm(struct radeon_device *rdev)
@@ -1358,8 +1335,6 @@ static void radeon_pm_fini_dpm(struct radeon_device *rdev)

if (rdev->pm.power_state)
kfree(rdev->pm.power_state);
-
- radeon_hwmon_fini(rdev);
}

void radeon_pm_fini(struct radeon_device *rdev)
--
1.7.9.7