Merge tag 'drm-misc-next-2016-11-16' of git://anongit.freedesktop.org/git/drm-misc into drm-next

Another pile of misc:
- Explicit fencing for atomic! Big thanks to Gustavo, Sean, Rob 3x, Brian
  and anyone else I've forgotten to make this happen.
- roll out fbdev helper ops to drivers (Stefan Christ)
- last bits of drm_crtc split-up&kerneldoc
- some drm_irq.c crtc functions cleanup
- prepare_fb helper for cma, works correctly with explicit fencing (Marek
  Vasut)
- misc small patches all over

* tag 'drm-misc-next-2016-11-16' of git://anongit.freedesktop.org/git/drm-misc: (51 commits)
  drm/fence: add out-fences support
  drm/fence: add fence timeline to drm_crtc
  drm/fence: add in-fences support
  drm/bridge: analogix_dp: return error if transfer none byte
  drm: drm_irq.h header cleanup
  drm/irq: Unexport drm_vblank_on/off
  drm/irq: Unexport drm_vblank_count
  drm/irq: Make drm_vblank_pre/post_modeset internal
  drm/nouveau: Use drm_crtc_vblank_off/on
  drm/amdgpu: Use drm_crtc_vblank_on/off for dce6
  drm/color: document NULL values and default settings better
  drm: Drop externs from drm_crtc.h
  drm: Move tile group code into drm_connector.c
  drm: Extract drm_mode_config.[hc]
  Revert "drm: Add aspect ratio parsing in DRM layer"
  Revert "drm: Add and handle new aspect ratios in DRM layer"
  drm/print: Move kerneldoc next to definition
  drm: Consolidate dumb buffer docs
  drm: Clean up kerneldoc for struct drm_driver
  drm: Extract drm_drv.h
  ...

2 files changed, 7 insertions, 10 deletions

diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index fcf4b1971eba..d51a7d23c358 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -225,7 +225,7 @@ static inline struct dma_fence *dma_fence_get_rcu(struct dma_fence *fence)
 
 /**
  * dma_fence_get_rcu_safe  - acquire a reference to an RCU tracked fence
- * @fence:	[in]	pointer to fence to increase refcount of
+ * @fencep:	[in]	pointer to fence to increase refcount of
  *
  * Function returns NULL if no refcount could be obtained, or the fence.
  * This function handles acquiring a reference to a fence that may be
diff --git a/include/linux/reservation.h b/include/linux/reservation.h
index 2e313cca08f0..d9706a6f5ae2 100644
--- a/include/linux/reservation.h
+++ b/include/linux/reservation.h
@@ -177,17 +177,14 @@ static inline struct dma_fence *
 reservation_object_get_excl_rcu(struct reservation_object *obj)
 {
 	struct dma_fence *fence;
-	unsigned seq;
-retry:
-	seq = read_seqcount_begin(&obj->seq);
+
+	if (!rcu_access_pointer(obj->fence_excl))
+		return NULL;
+
 	rcu_read_lock();
-	fence = rcu_dereference(obj->fence_excl);
-	if (read_seqcount_retry(&obj->seq, seq)) {
-		rcu_read_unlock();
-		goto retry;
-	}
-	fence = dma_fence_get(fence);
+	fence = dma_fence_get_rcu_safe(&obj->fence_excl);
 	rcu_read_unlock();
+
 	return fence;
 }