Merge tag 'topic/drm-misc-2015-10-19' of git://anongit.freedesktop.org/drm-intel into drm-next

More drm-misc for 4.4.
- fb refcount fix in atomic fbdev
- various locking reworks to reduce drm_global_mutex and dev->struct_mutex
- rename docbook to gpu.tmpl and include vga_switcheroo stuff, plus more
  vga_switcheroo (Lukas Wunner)
- viewport check fixes for atomic drivers from Ville
- DRM_DEBUG_VBL from Ville
- non-contentious header fixes from Mikko Rapeli
- small things all over

* tag 'topic/drm-misc-2015-10-19' of git://anongit.freedesktop.org/drm-intel: (31 commits)
  drm/fb-helper: Fix fb refcounting in pan_display_atomic
  drm/fb-helper: Set plane rotation directly
  drm: fix mutex leak in drm_dp_get_mst_branch_device
  drm: Check plane src coordinates correctly during page flip for atomic drivers
  drm: Check crtc viewport correctly with rotated primary plane on atomic drivers
  drm: Refactor plane src coordinate checks
  drm: Swap w/h when converting the mode to src coordidates for a rotated primary plane
  drm: Don't leak fb when plane crtc coodinates are bad
  ALSA: hda - Spell vga_switcheroo consistently
  drm/gem: Use kref_get_unless_zero for the weak mmap references
  drm/vgem: Drop vgem_drm_gem_mmap
  drm: Fix return value of drm_framebuffer_init()
  drm/gem: Use container_of in drm_gem_object_free
  drm/gem: Check locking in drm_gem_object_unreference
  drm/gem: Drop struct_mutex requirement from drm_gem_mmap_obj
  drm/i810_drm.h: include drm/drm.h
  r128_drm.h: include drm/drm.h
  savage_drm.h: include <drm/drm.h>
  gpu/doc: Convert to markdown harder
  gpu/doc: Add vga_switcheroo documentation
  ...

1 files changed, 4 insertions, 1 deletions

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 7a592d7e398b..15e7f007380f 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -142,8 +142,11 @@ drm_gem_object_reference(struct drm_gem_object *obj)
 static inline void
 drm_gem_object_unreference(struct drm_gem_object *obj)
 {
-	if (obj != NULL)
+	if (obj != NULL) {
+		WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
+
 		kref_put(&obj->refcount, drm_gem_object_free);
+	}
 }
 
 static inline void