drm/sysfs: Annote lockless show functions with READ_ONCE

For documentation and paranoia.
Acked-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1459331120-27864-4-git-send-email-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_sysfs.c

@@ -208,9 +208,12 @@ static ssize_t status_show(struct device *device,
 			   char *buf)
 {
 	struct drm_connector *connector = to_drm_connector(device);
+	enum drm_connector_status status;
+
+	status = READ_ONCE(connector->status);
 
 	return snprintf(buf, PAGE_SIZE, "%s\n",
-			drm_get_connector_status_name(connector->status));
+			drm_get_connector_status_name(status));
 }
 
 static ssize_t dpms_show(struct device *device,
@@ -231,9 +234,11 @@ static ssize_t enabled_show(struct device *device,
 			   char *buf)
 {
 	struct drm_connector *connector = to_drm_connector(device);
+	bool enabled;
+
+	enabled = READ_ONCE(connector->encoder);
 
-	return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
-			"disabled");
+	return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
 }
 
 static ssize_t edid_show(struct file *filp, struct kobject *kobj,