Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "Just a couple of dma-buf related fixes and some amdgpu fixes, along
  with a regression fix for radeon off but default feature, but makes my
  30" monitor happy again"

* 'drm-next' of git://people.freedesktop.org/~airlied/linux:
  drm/radeon/mst: cleanup code indentation
  drm/radeon/mst: fix regression in lane/link handling.
  drm/amdgpu: add invalidate_page callback for userptrs
  drm/amdgpu: Revert "remove the userptr rmn->lock"
  drm/amdgpu: clean up path handling for powerplay
  drm/amd/powerplay: fix memory leak of tdp_table
  dma-buf/fence: fix fence_is_later v2
  dma-buf: Update docs for SYNC ioctl
  drm: remove excess description
  dma-buf, drm, ion: Propagate error code from dma_buf_start_cpu_access()
  drm/atmel-hlcdc: use helper to get crtc state
  drm/atomic: use helper to get crtc state

15 files changed, 147 insertions, 98 deletions

diff --git a/Documentation/dma-buf-sharing.txt b/Documentation/dma-buf-sharing.txt
index 32ac32e773e1..ca44c5820585 100644
--- a/Documentation/dma-buf-sharing.txt
+++ b/Documentation/dma-buf-sharing.txt
@@ -352,7 +352,8 @@ Being able to mmap an export dma-buf buffer object has 2 main use-cases:
 
    No special interfaces, userspace simply calls mmap on the dma-buf fd, making
    sure that the cache synchronization ioctl (DMA_BUF_IOCTL_SYNC) is *always*
-   used when the access happens. This is discussed next paragraphs.
+   used when the access happens. Note that DMA_BUF_IOCTL_SYNC can fail with
+   -EAGAIN or -EINTR, in which case it must be restarted.
 
    Some systems might need some sort of cache coherency management e.g. when
    CPU and GPU domains are being accessed through dma-buf at the same time. To
@@ -366,10 +367,10 @@ Being able to mmap an export dma-buf buffer object has 2 main use-cases:
        want (with the new data being consumed by the GPU or say scanout device)
      - munmap once you don't need the buffer any more
 
-    Therefore, for correctness and optimal performance, systems with the memory
-    cache shared by the GPU and CPU i.e. the "coherent" and also the
-    "incoherent" are always required to use SYNC_START and SYNC_END before and
-    after, respectively, when accessing the mapped address.
+    For correctness and optimal performance, it is always required to use
+    SYNC_START and SYNC_END before and after, respectively, when accessing the
+    mapped address. Userspace cannot rely on coherent access, even when there
+    are systems where it just works without calling these ioctls.
 
 2. Supporting existing mmap interfaces in importers
 
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 9810d1df0691..4a2c07ee6677 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -259,6 +259,7 @@ static long dma_buf_ioctl(struct file *file,
 	struct dma_buf *dmabuf;
 	struct dma_buf_sync sync;
 	enum dma_data_direction direction;
+	int ret;
 
 	dmabuf = file->private_data;
 
@@ -285,11 +286,11 @@ static long dma_buf_ioctl(struct file *file,
 		}
 
 		if (sync.flags & DMA_BUF_SYNC_END)
-			dma_buf_end_cpu_access(dmabuf, direction);
+			ret = dma_buf_end_cpu_access(dmabuf, direction);
 		else
-			dma_buf_begin_cpu_access(dmabuf, direction);
+			ret = dma_buf_begin_cpu_access(dmabuf, direction);
 
-		return 0;
+		return ret;
 	default:
 		return -ENOTTY;
 	}
@@ -611,15 +612,19 @@ EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access);
  * @dmabuf:	[in]	buffer to complete cpu access for.
  * @direction:	[in]	length of range for cpu access.
  *
- * This call must always succeed.
+ * Can return negative error values, returns 0 on success.
  */
-void dma_buf_end_cpu_access(struct dma_buf *dmabuf,
-			    enum dma_data_direction direction)
+int dma_buf_end_cpu_access(struct dma_buf *dmabuf,
+			   enum dma_data_direction direction)
 {
+	int ret = 0;
+
 	WARN_ON(!dmabuf);
 
 	if (dmabuf->ops->end_cpu_access)
-		dmabuf->ops->end_cpu_access(dmabuf, direction);
+		ret = dmabuf->ops->end_cpu_access(dmabuf, direction);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index d7ec9bd6755f..9f4a45cd2aab 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -48,7 +48,8 @@ struct amdgpu_mn {
 	/* protected by adev->mn_lock */
 	struct hlist_node	node;
 
-	/* objects protected by mm->mmap_sem */
+	/* objects protected by lock */
+	struct mutex		lock;
 	struct rb_root		objects;
 };
 
@@ -72,7 +73,7 @@ static void amdgpu_mn_destroy(struct work_struct *work)
 	struct amdgpu_bo *bo, *next_bo;
 
 	mutex_lock(&adev->mn_lock);
-	down_write(&rmn->mm->mmap_sem);
+	mutex_lock(&rmn->lock);
 	hash_del(&rmn->node);
 	rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects,
 					     it.rb) {
@@ -82,7 +83,7 @@ static void amdgpu_mn_destroy(struct work_struct *work)
 		}
 		kfree(node);
 	}
-	up_write(&rmn->mm->mmap_sem);
+	mutex_unlock(&rmn->lock);
 	mutex_unlock(&adev->mn_lock);
 	mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);
 	kfree(rmn);
@@ -105,6 +106,76 @@ static void amdgpu_mn_release(struct mmu_notifier *mn,
 }
 
 /**
+ * amdgpu_mn_invalidate_node - unmap all BOs of a node
+ *
+ * @node: the node with the BOs to unmap
+ *
+ * We block for all BOs and unmap them by move them
+ * into system domain again.
+ */
+static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,
+				      unsigned long start,
+				      unsigned long end)
+{
+	struct amdgpu_bo *bo;
+	long r;
+
+	list_for_each_entry(bo, &node->bos, mn_list) {
+
+		if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start, end))
+			continue;
+
+		r = amdgpu_bo_reserve(bo, true);
+		if (r) {
+			DRM_ERROR("(%ld) failed to reserve user bo\n", r);
+			continue;
+		}
+
+		r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
+			true, false, MAX_SCHEDULE_TIMEOUT);
+		if (r <= 0)
+			DRM_ERROR("(%ld) failed to wait for user bo\n", r);
+
+		amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
+		r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
+		if (r)
+			DRM_ERROR("(%ld) failed to validate user bo\n", r);
+
+		amdgpu_bo_unreserve(bo);
+	}
+}
+
+/**
+ * amdgpu_mn_invalidate_page - callback to notify about mm change
+ *
+ * @mn: our notifier
+ * @mn: the mm this callback is about
+ * @address: address of invalidate page
+ *
+ * Invalidation of a single page. Blocks for all BOs mapping it
+ * and unmap them by move them into system domain again.
+ */
+static void amdgpu_mn_invalidate_page(struct mmu_notifier *mn,
+				      struct mm_struct *mm,
+				      unsigned long address)
+{
+	struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
+	struct interval_tree_node *it;
+
+	mutex_lock(&rmn->lock);
+
+	it = interval_tree_iter_first(&rmn->objects, address, address);
+	if (it) {
+		struct amdgpu_mn_node *node;
+
+		node = container_of(it, struct amdgpu_mn_node, it);
+		amdgpu_mn_invalidate_node(node, address, address);
+	}
+
+	mutex_unlock(&rmn->lock);
+}
+
+/**
  * amdgpu_mn_invalidate_range_start - callback to notify about mm change
  *
  * @mn: our notifier
@@ -126,44 +197,24 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
 	/* notification is exclusive, but interval is inclusive */
 	end -= 1;
 
+	mutex_lock(&rmn->lock);
+
 	it = interval_tree_iter_first(&rmn->objects, start, end);
 	while (it) {
 		struct amdgpu_mn_node *node;
-		struct amdgpu_bo *bo;
-		long r;
 
 		node = container_of(it, struct amdgpu_mn_node, it);
 		it = interval_tree_iter_next(it, start, end);
 
-		list_for_each_entry(bo, &node->bos, mn_list) {
-
-			if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start,
-							  end))
-				continue;
-
-			r = amdgpu_bo_reserve(bo, true);
-			if (r) {
-				DRM_ERROR("(%ld) failed to reserve user bo\n", r);
-				continue;
-			}
-
-			r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
-				true, false, MAX_SCHEDULE_TIMEOUT);
-			if (r <= 0)
-				DRM_ERROR("(%ld) failed to wait for user bo\n", r);
-
-			amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
-			r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
-			if (r)
-				DRM_ERROR("(%ld) failed to validate user bo\n", r);
-
-			amdgpu_bo_unreserve(bo);
-		}
+		amdgpu_mn_invalidate_node(node, start, end);
 	}
+
+	mutex_unlock(&rmn->lock);
 }
 
 static const struct mmu_notifier_ops amdgpu_mn_ops = {
 	.release = amdgpu_mn_release,
+	.invalidate_page = amdgpu_mn_invalidate_page,
 	.invalidate_range_start = amdgpu_mn_invalidate_range_start,
 };
 
@@ -196,6 +247,7 @@ static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
 	rmn->adev = adev;
 	rmn->mm = mm;
 	rmn->mn.ops = &amdgpu_mn_ops;
+	mutex_init(&rmn->lock);
 	rmn->objects = RB_ROOT;
 
 	r = __mmu_notifier_register(&rmn->mn, mm);
@@ -242,7 +294,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
 
 	INIT_LIST_HEAD(&bos);
 
-	down_write(&rmn->mm->mmap_sem);
+	mutex_lock(&rmn->lock);
 
 	while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
 		kfree(node);
@@ -256,7 +308,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
 	if (!node) {
 		node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_KERNEL);
 		if (!node) {
-			up_write(&rmn->mm->mmap_sem);
+			mutex_unlock(&rmn->lock);
 			return -ENOMEM;
 		}
 	}
@@ -271,7 +323,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
 
 	interval_tree_insert(&node->it, &rmn->objects);
 
-	up_write(&rmn->mm->mmap_sem);
+	mutex_unlock(&rmn->lock);
 
 	return 0;
 }
@@ -297,7 +349,7 @@ void amdgpu_mn_unregister(struct amdgpu_bo *bo)
 		return;
 	}
 
-	down_write(&rmn->mm->mmap_sem);
+	mutex_lock(&rmn->lock);
 
 	/* save the next list entry for later */
 	head = bo->mn_list.next;
@@ -312,6 +364,6 @@ void amdgpu_mn_unregister(struct amdgpu_bo *bo)
 		kfree(node);
 	}
 
-	up_write(&rmn->mm->mmap_sem);
+	mutex_unlock(&rmn->lock);
 	mutex_unlock(&adev->mn_lock);
 }
diff --git a/drivers/gpu/drm/amd/powerplay/Makefile b/drivers/gpu/drm/amd/powerplay/Makefile
index e195bf59da86..043e6ebab575 100644
--- a/drivers/gpu/drm/amd/powerplay/Makefile
+++ b/drivers/gpu/drm/amd/powerplay/Makefile
@@ -1,17 +1,17 @@
 
 subdir-ccflags-y += -Iinclude/drm  \
-		-Idrivers/gpu/drm/amd/powerplay/inc/  \
-		-Idrivers/gpu/drm/amd/include/asic_reg  \
-		-Idrivers/gpu/drm/amd/include  \
-		-Idrivers/gpu/drm/amd/powerplay/smumgr\
-		-Idrivers/gpu/drm/amd/powerplay/hwmgr \
-		-Idrivers/gpu/drm/amd/powerplay/eventmgr
+		-I$(FULL_AMD_PATH)/powerplay/inc/  \
+		-I$(FULL_AMD_PATH)/include/asic_reg  \
+		-I$(FULL_AMD_PATH)/include  \
+		-I$(FULL_AMD_PATH)/powerplay/smumgr\
+		-I$(FULL_AMD_PATH)/powerplay/hwmgr \
+		-I$(FULL_AMD_PATH)/powerplay/eventmgr
 
 AMD_PP_PATH = ../powerplay
 
 PP_LIBS = smumgr hwmgr eventmgr
 
-AMD_POWERPLAY = $(addsuffix /Makefile,$(addprefix drivers/gpu/drm/amd/powerplay/,$(PP_LIBS)))
+AMD_POWERPLAY = $(addsuffix /Makefile,$(addprefix $(FULL_AMD_PATH)/powerplay/,$(PP_LIBS)))
 
 include $(AMD_POWERPLAY)
 
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_processpptables.c b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_processpptables.c
index 34f4bef3691f..b156481b50e8 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_processpptables.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_processpptables.c
@@ -512,8 +512,10 @@ static int get_cac_tdp_table(
 
 	hwmgr->dyn_state.cac_dtp_table = kzalloc(table_size, GFP_KERNEL);
 
-	if (NULL == hwmgr->dyn_state.cac_dtp_table)
+	if (NULL == hwmgr->dyn_state.cac_dtp_table) {
+		kfree(tdp_table);
 		return -ENOMEM;
+	}
 
 	memset(hwmgr->dyn_state.cac_dtp_table, 0x00, table_size);
 
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
index 1ffe9c329c46..d65dcaee3832 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -558,7 +558,7 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
 	if (!state->base.crtc || !fb)
 		return 0;
 
-	crtc_state = s->state->crtc_states[drm_crtc_index(s->crtc)];
+	crtc_state = drm_atomic_get_existing_crtc_state(s->state, s->crtc);
 	mode = &crtc_state->adjusted_mode;
 
 	state->src_x = s->src_x;
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index a2596eb803fc..8ee1db866e80 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -380,7 +380,6 @@ EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
  * drm_atomic_replace_property_blob - replace a blob property
  * @blob: a pointer to the member blob to be replaced
  * @new_blob: the new blob to replace with
- * @expected_size: the expected size of the new blob
  * @replaced: whether the blob has been replaced
  *
  * RETURNS:
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 2bb90faa0ee2..4befe25c81c7 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -67,7 +67,8 @@ drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
 	struct drm_crtc_state *crtc_state;
 
 	if (plane->state->crtc) {
-		crtc_state = state->crtc_states[drm_crtc_index(plane->state->crtc)];
+		crtc_state = drm_atomic_get_existing_crtc_state(state,
+								plane->state->crtc);
 
 		if (WARN_ON(!crtc_state))
 			return;
@@ -76,8 +77,8 @@ drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
 	}
 
 	if (plane_state->crtc) {
-		crtc_state =
-			state->crtc_states[drm_crtc_index(plane_state->crtc)];
+		crtc_state = drm_atomic_get_existing_crtc_state(state,
+								plane_state->crtc);
 
 		if (WARN_ON(!crtc_state))
 			return;
@@ -374,8 +375,8 @@ mode_fixup(struct drm_atomic_state *state)
 		if (!conn_state->crtc || !conn_state->best_encoder)
 			continue;
 
-		crtc_state =
-			state->crtc_states[drm_crtc_index(conn_state->crtc)];
+		crtc_state = drm_atomic_get_existing_crtc_state(state,
+								conn_state->crtc);
 
 		/*
 		 * Each encoder has at most one connector (since we always steal
@@ -679,7 +680,8 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 		if (!old_conn_state->crtc)
 			continue;
 
-		old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
+		old_crtc_state = drm_atomic_get_existing_crtc_state(old_state,
+								    old_conn_state->crtc);
 
 		if (!old_crtc_state->active ||
 		    !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
index 1f3eef6fb345..0506016e18e0 100644
--- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
@@ -228,25 +228,20 @@ static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_dire
 	return ret;
 }
 
-static void i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
+static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
 {
 	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
 	struct drm_device *dev = obj->base.dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	bool was_interruptible;
 	int ret;
 
-	mutex_lock(&dev->struct_mutex);
-	was_interruptible = dev_priv->mm.interruptible;
-	dev_priv->mm.interruptible = false;
+	ret = i915_mutex_lock_interruptible(dev);
+	if (ret)
+		return ret;
 
 	ret = i915_gem_object_set_to_gtt_domain(obj, false);
-
-	dev_priv->mm.interruptible = was_interruptible;
 	mutex_unlock(&dev->struct_mutex);
 
-	if (unlikely(ret))
-		DRM_ERROR("unable to flush buffer following CPU access; rendering may be corrupt\n");
+	return ret;
 }
 
 static const struct dma_buf_ops i915_dmabuf_ops =  {
diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
index 3cf8aab23a39..af267c35d813 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
@@ -97,11 +97,12 @@ static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
 	return omap_gem_get_pages(obj, &pages, true);
 }
 
-static void omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
-		enum dma_data_direction dir)
+static int omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
+					  enum dma_data_direction dir)
 {
 	struct drm_gem_object *obj = buffer->priv;
 	omap_gem_put_pages(obj);
+	return 0;
 }
 
 
diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
index df7a1719c841..43cffb526b0c 100644
--- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
+++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
@@ -510,6 +510,7 @@ static bool radeon_mst_mode_fixup(struct drm_encoder *encoder,
 {
 	struct radeon_encoder_mst *mst_enc;
 	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+	struct radeon_connector_atom_dig *dig_connector;
 	int bpp = 24;
 
 	mst_enc = radeon_encoder->enc_priv;
@@ -523,22 +524,11 @@ static bool radeon_mst_mode_fixup(struct drm_encoder *encoder,
 
 
 	drm_mode_set_crtcinfo(adjusted_mode, 0);
-	{
-	  struct radeon_connector_atom_dig *dig_connector;
-	  int ret;
-
-	  dig_connector = mst_enc->connector->con_priv;
-	  ret = radeon_dp_get_dp_link_config(&mst_enc->connector->base,
-					     dig_connector->dpcd, adjusted_mode->clock,
-					     &dig_connector->dp_lane_count,
-					     &dig_connector->dp_clock);
-	  if (ret) {
-		  dig_connector->dp_lane_count = 0;
-		  dig_connector->dp_clock = 0;
-	  }
-	  DRM_DEBUG_KMS("dig clock %p %d %d\n", dig_connector,
-			dig_connector->dp_lane_count, dig_connector->dp_clock);
-	}
+	dig_connector = mst_enc->connector->con_priv;
+	dig_connector->dp_lane_count = drm_dp_max_lane_count(dig_connector->dpcd);
+	dig_connector->dp_clock = drm_dp_max_link_rate(dig_connector->dpcd);
+	DRM_DEBUG_KMS("dig clock %p %d %d\n", dig_connector,
+		      dig_connector->dp_lane_count, dig_connector->dp_clock);
 	return true;
 }
 
diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index c427499133d6..33239a2b264a 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -423,8 +423,8 @@ static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
 	}
 
 	if (ufb->obj->base.import_attach) {
-		dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
-				       DMA_FROM_DEVICE);
+		ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
+					     DMA_FROM_DEVICE);
 	}
 
  unlock:
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index bceb81309787..85365672c931 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1141,14 +1141,16 @@ static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
 	return PTR_ERR_OR_ZERO(vaddr);
 }
 
-static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
-				       enum dma_data_direction direction)
+static int ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
+				      enum dma_data_direction direction)
 {
 	struct ion_buffer *buffer = dmabuf->priv;
 
 	mutex_lock(&buffer->lock);
 	ion_buffer_kmap_put(buffer);
 	mutex_unlock(&buffer->lock);
+
+	return 0;
 }
 
 static struct dma_buf_ops dma_buf_ops = {
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 532108ea0c1c..3fe90d494edb 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -94,7 +94,7 @@ struct dma_buf_ops {
 	void (*release)(struct dma_buf *);
 
 	int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction);
-	void (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
+	int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
 	void *(*kmap_atomic)(struct dma_buf *, unsigned long);
 	void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
 	void *(*kmap)(struct dma_buf *, unsigned long);
@@ -224,8 +224,8 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
 				enum dma_data_direction);
 int dma_buf_begin_cpu_access(struct dma_buf *dma_buf,
 			     enum dma_data_direction dir);
-void dma_buf_end_cpu_access(struct dma_buf *dma_buf,
-			    enum dma_data_direction dir);
+int dma_buf_end_cpu_access(struct dma_buf *dma_buf,
+			   enum dma_data_direction dir);
 void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long);
 void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long, void *);
 void *dma_buf_kmap(struct dma_buf *, unsigned long);
diff --git a/include/linux/fence.h b/include/linux/fence.h
index 605bd88246a6..2b17698b60b8 100644
--- a/include/linux/fence.h
+++ b/include/linux/fence.h
@@ -294,7 +294,7 @@ static inline bool fence_is_later(struct fence *f1, struct fence *f2)
 	if (WARN_ON(f1->context != f2->context))
 		return false;
 
-	return f1->seqno - f2->seqno < INT_MAX;
+	return (int)(f1->seqno - f2->seqno) > 0;
 }
 
 /**