drm/radeon: properly unregister hwmon interface (v2)

Need to properly unregister the hwmon device on driver
unload.

v2: minor clean up

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=73931

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 0c4473db8501dbf008a44414c8d99dddf5ba66d3..d79895aebc591278da9328216de0a7e871aaae36 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -603,7 +603,6 @@ static const struct attribute_group *hwmon_groups[] = {
 static int radeon_hwmon_init(struct radeon_device *rdev)
 {
        int err = 0;
-       struct device *hwmon_dev;
 
        switch (rdev->pm.int_thermal_type) {
        case THERMAL_TYPE_RV6XX:
@@ -616,11 +615,11 @@ static int radeon_hwmon_init(struct radeon_device *rdev)
        case THERMAL_TYPE_KV:
                if (rdev->asic->pm.get_temperature == NULL)
                        return err;
-               hwmon_dev = hwmon_device_register_with_groups(rdev->dev,
-                                                             "radeon", rdev,
-                                                             hwmon_groups);
-               if (IS_ERR(hwmon_dev)) {
-                       err = PTR_ERR(hwmon_dev);
+               rdev->pm.int_hwmon_dev = hwmon_device_register_with_groups(rdev->dev,
+                                                                          "radeon", rdev,
+                                                                          hwmon_groups);
+               if (IS_ERR(rdev->pm.int_hwmon_dev)) {
+                       err = PTR_ERR(rdev->pm.int_hwmon_dev);
                        dev_err(rdev->dev,
                                "Unable to register hwmon device: %d\n", err);
                }
@@ -632,6 +631,12 @@ 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)
+               hwmon_device_unregister(rdev->pm.int_hwmon_dev);
+}
+
 static void radeon_dpm_thermal_work_handler(struct work_struct *work)
 {
        struct radeon_device *rdev =
@@ -1353,6 +1358,8 @@ static void radeon_pm_fini_old(struct radeon_device *rdev)
                device_remove_file(rdev->dev, &dev_attr_power_method);
        }
 
+       radeon_hwmon_fini(rdev);
+
        if (rdev->pm.power_state)
                kfree(rdev->pm.power_state);
 }
@@ -1372,6 +1379,8 @@ static void radeon_pm_fini_dpm(struct radeon_device *rdev)
        }
        radeon_dpm_fini(rdev);
 
+       radeon_hwmon_fini(rdev);
+
        if (rdev->pm.power_state)
                kfree(rdev->pm.power_state);
 }