re: drm/gem: Check locking in drm_gem_object_unreference

Hello Daniel Vetter,

This is a semi-automatic email about new static checker warnings.

The patch 5771551c4877: "drm/gem: Check locking in drm_gem_object_unreference" from Oct 15, 2015, leads to the following Smatch complaint:

include/drm/drm_gem.h:147 drm_gem_object_unreference() warn: variable dereferenced before check 'obj' (see line 145)

include/drm/drm_gem.h 144 { 145 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ deref.

146 147 if (obj != NULL)

check.

148 kref_put(&obj->refcount, drm_gem_object_free); 149 }

regards, dan carpenter