drm: fail gracefully when proc isn't setup.
If drm can't find proc it should fail more gracefully, than just
oopsing, this tests drm_class is NULL, and sets it to NULL in the
fail paths.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 45cf1dd..45ac8d6 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -134,6 +134,7 @@
return;
class_remove_file(drm_class, &class_attr_version.attr);
class_destroy(drm_class);
+ drm_class = NULL;
}
/**
@@ -554,6 +555,9 @@
int drm_class_device_register(struct device *dev)
{
+ if (!drm_class || IS_ERR(drm_class))
+ return -ENOENT;
+
dev->class = drm_class;
return device_register(dev);
}