drm/radeon: don't try to recreate sysfs entries on resume

Fixes a harmless error message caused by:
51a4726bSigned-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

drivers/gpu/drm/radeon/radeon.h

@@ -1658,6 +1658,7 @@ struct radeon_pm {
 	u8                      fan_max_rpm;
 	/* dpm */
 	bool                    dpm_enabled;
+	bool                    sysfs_initialized;
 	struct radeon_dpm       dpm;
 };
 

drivers/gpu/drm/radeon/radeon_pm.c

@@ -1528,6 +1528,7 @@ int radeon_pm_late_init(struct radeon_device *rdev)
 
 	if (rdev->pm.pm_method == PM_METHOD_DPM) {
 		if (rdev->pm.dpm_enabled) {
+			if (!rdev->pm.sysfs_initialized) {
 				ret = device_create_file(rdev->dev, &dev_attr_power_dpm_state);
 				if (ret)
 					DRM_ERROR("failed to create device file for dpm state\n");
@@ -1541,6 +1542,9 @@ int radeon_pm_late_init(struct radeon_device *rdev)
 				ret = device_create_file(rdev->dev, &dev_attr_power_method);
 				if (ret)
 					DRM_ERROR("failed to create device file for power method\n");
+				if (!ret)
+					rdev->pm.sysfs_initialized = true;
+			}
 
 			mutex_lock(&rdev->pm.mutex);
 			ret = radeon_dpm_late_enable(rdev);
@@ -1556,7 +1560,8 @@ int radeon_pm_late_init(struct radeon_device *rdev)
 			}
 		}
 	} else {
-		if (rdev->pm.num_power_states > 1) {
+		if ((rdev->pm.num_power_states > 1) &&
+		    (!rdev->pm.sysfs_initialized)) {
 			/* where's the best place to put these? */
 			ret = device_create_file(rdev->dev, &dev_attr_power_profile);
 			if (ret)
@@ -1564,6 +1569,8 @@ int radeon_pm_late_init(struct radeon_device *rdev)
 			ret = device_create_file(rdev->dev, &dev_attr_power_method);
 			if (ret)
 				DRM_ERROR("failed to create device file for power method\n");
+			if (!ret)
+				rdev->pm.sysfs_initialized = true;
 		}
 	}
 	return ret;