Merge tag 'topic/drm-misc-2016-05-04' of git://anongit.freedesktop.org/drm-intel into drm-next

Ofc I promise just a few leftovers for drm-misc and somehow it's the
biggest pull. But really mostly trivial stuff:
- MAINTAINERS updates from Emil
- rename async to nonblock in atomic_commit to avoid the confusion between
  nonblocking ioctl and async flip (= not vblank synced), from Maarten.
  Needs to be regened with newer drivers, but probably only after -rc1 to
  catch them all.
- actually lockless gem_object_free, plus acked driver conversion patches.
  All the trickier prep stuff already is in drm-next.
- Noralf's nice work for generic defio support in our fbdev emulation.
  Keeps the udl hack, and qxl is tested by Gerd.

* tag 'topic/drm-misc-2016-05-04' of git://anongit.freedesktop.org/drm-intel: (47 commits)
  drm: Fixup locking WARN_ON mistake around gem_object_free_unlocked
  drm/etnaviv: Use lockless gem BO free callback
  drm/imx: Use lockless gem BO free callback
  drm/radeon: Use lockless gem BO free callback
  drm/amdgpu: Use lockless gem BO free callback
  drm/gem: support BO freeing without dev->struct_mutex
  MAINTAINERS: Add myself for the new VC4 (RPi GPU) graphics driver.
  MAINTAINERS: Add a bunch of legacy (UMS) DRM drivers
  MAINTAINERS: Add a few DRM drivers by Dave Airlie
  MAINTAINERS: List the correct git repo for the Renesas DRM drivers
  MAINTAINERS: Update the files list for the Renesas DRM drivers
  MAINTAINERS: Update the files list for the Armada DRM driver
  MAINTAINERS: Update the files list for the Rockchip DRM driver
  MAINTAINERS: Update the files list for the Exynos DRM driver
  MAINTAINERS: Add maintainer entry for the VMWGFX DRM driver
  MAINTAINERS: Add maintainer entry for the MSM DRM driver
  MAINTAINERS: Add maintainer entry for the Nouveau DRM driver
  MAINTAINERS: Update the files list for the Etnaviv DRM driver
  MAINTAINERS: Remove unneded wildcard for the i915 DRM driver
  drm/atomic: Add WARN_ON when state->acquire_ctx is not set.
  ...

1 files changed, 55 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 25dac31eef37..f716308fb48c 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -804,14 +804,67 @@ drm_gem_object_free(struct kref *kref)
 		container_of(kref, struct drm_gem_object, refcount);
 	struct drm_device *dev = obj->dev;
 
-	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+	if (dev->driver->gem_free_object_unlocked) {
+		dev->driver->gem_free_object_unlocked(obj);
+	} else if (dev->driver->gem_free_object) {
+		WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 
-	if (dev->driver->gem_free_object != NULL)
 		dev->driver->gem_free_object(obj);
+	}
 }
 EXPORT_SYMBOL(drm_gem_object_free);
 
 /**
+ * drm_gem_object_unreference_unlocked - release a GEM BO reference
+ * @obj: GEM buffer object
+ *
+ * This releases a reference to @obj. Callers must not hold the
+ * dev->struct_mutex lock when calling this function.
+ *
+ * See also __drm_gem_object_unreference().
+ */
+void
+drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
+{
+	struct drm_device *dev;
+
+	if (!obj)
+		return;
+
+	dev = obj->dev;
+	might_lock(&dev->struct_mutex);
+
+	if (dev->driver->gem_free_object_unlocked)
+		kref_put(&obj->refcount, drm_gem_object_free);
+	else if (kref_put_mutex(&obj->refcount, drm_gem_object_free,
+				&dev->struct_mutex))
+		mutex_unlock(&dev->struct_mutex);
+}
+EXPORT_SYMBOL(drm_gem_object_unreference_unlocked);
+
+/**
+ * drm_gem_object_unreference - release a GEM BO reference
+ * @obj: GEM buffer object
+ *
+ * This releases a reference to @obj. Callers must hold the dev->struct_mutex
+ * lock when calling this function, even when the driver doesn't use
+ * dev->struct_mutex for anything.
+ *
+ * For drivers not encumbered with legacy locking use
+ * drm_gem_object_unreference_unlocked() instead.
+ */
+void
+drm_gem_object_unreference(struct drm_gem_object *obj)
+{
+	if (obj) {
+		WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
+
+		kref_put(&obj->refcount, drm_gem_object_free);
+	}
+}
+EXPORT_SYMBOL(drm_gem_object_unreference);
+
+/**
  * drm_gem_vm_open - vma->ops->open implementation for GEM
  * @vma: VM area structure
  *