Merge tag 'drm-misc-next-2022-06-08' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

drm-misc-next for 5.20:

UAPI Changes:

 * connector: export bpc limits in debugfs

 * dma-buf: Print buffer name in debugfs

Cross-subsystem Changes:

 * dma-buf: Improve dma-fence handling; Cleanups

 * fbdev: Device-unregistering fixes

Core Changes:

 * client: Only use driver-validated modes to avoid blank screen

 * dp-aux: Make probing more reliable; Small fixes

 * edit: CEA data-block iterators; Introduce struct drm_edid; Many cleanups

 * gem: Don't use framebuffer format's non-exising color planes

 * probe-helper: Use 640x480 as DisplayPort fallback; Refactoring

 * scheduler: Don't kill jobs in interrupt context

Driver Changes:

 * amdgpu: Use atomic fence helpers in DM; Fix VRAM address calculation;
   Export CRTC bpc settings via debugfs

 * bridge: Add TI-DLPC3433;  anx7625: Fixes;  fy07024di26a30d: Optional
   GPIO reset;  icn6211: Cleanups;  ldb: Add reg and reg-name properties
   to bindings, Kconfig fixes;  lt9611: Fix display sensing;  lt9611uxc:
   Fixes;  nwl-dsi: Fixes;  ps8640: Cleanups;  st7735r: Fixes;  tc358767:
   DSI/DPI refactoring and DSI-to-eDP support, Fixes; ti-sn65dsi83:
   Fixes;

 * gma500: Cleanup connector I2C handling

 * hyperv: Unify VRAM allocation of Gen1 and Gen2

 * i915: export CRTC bpc settings via debugfs

 * meson: Support YUV422 output; Refcount fixes

 * mgag200: Support damage clipping; Support gamma handling; Protect
   concurrent HW access; Fixes to connector; Store model-specific limits
   in device-info structure; Cleanups

 * nouveau: Fixes and Cleanups

 * panel: Kconfig fixes

 * panfrost: Valhall support

 * r128: Fix bit-shift overflow

 * rockchip: Locking fixes in error path; Minor cleanups

 * ssd130x: Fix built-in linkage

 * ttm: Cleanups

 * udl; Always advertize VGA connector

 * fbdev/vesa: Support COMPILE_TEST

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/YqBtumw05JZDEZE2@linux-uq9g

1 files changed, 7 insertions, 50 deletions

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 7e48dcd1bee4..bbad9e4696e7 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -184,6 +184,7 @@
  */
 
 #include <linux/anon_inodes.h>
+#include <linux/dma-fence-unwrap.h>
 #include <linux/file.h>
 #include <linux/fs.h>
 #include <linux/sched/signal.h>
@@ -853,57 +854,12 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 					&args->handle);
 }
 
-
-/*
- * Try to flatten a dma_fence_chain into a dma_fence_array so that it can be
- * added as timeline fence to a chain again.
- */
-static int drm_syncobj_flatten_chain(struct dma_fence **f)
-{
-	struct dma_fence_chain *chain = to_dma_fence_chain(*f);
-	struct dma_fence *tmp, **fences;
-	struct dma_fence_array *array;
-	unsigned int count;
-
-	if (!chain)
-		return 0;
-
-	count = 0;
-	dma_fence_chain_for_each(tmp, &chain->base)
-		++count;
-
-	fences = kmalloc_array(count, sizeof(*fences), GFP_KERNEL);
-	if (!fences)
-		return -ENOMEM;
-
-	count = 0;
-	dma_fence_chain_for_each(tmp, &chain->base)
-		fences[count++] = dma_fence_get(tmp);
-
-	array = dma_fence_array_create(count, fences,
-				       dma_fence_context_alloc(1),
-				       1, false);
-	if (!array)
-		goto free_fences;
-
-	dma_fence_put(*f);
-	*f = &array->base;
-	return 0;
-
-free_fences:
-	while (count--)
-		dma_fence_put(fences[count]);
-
-	kfree(fences);
-	return -ENOMEM;
-}
-
 static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
 					    struct drm_syncobj_transfer *args)
 {
 	struct drm_syncobj *timeline_syncobj = NULL;
+	struct dma_fence *fence, *tmp;
 	struct dma_fence_chain *chain;
-	struct dma_fence *fence;
 	int ret;
 
 	timeline_syncobj = drm_syncobj_find(file_private, args->dst_handle);
@@ -912,13 +868,14 @@ static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
 	}
 	ret = drm_syncobj_find_fence(file_private, args->src_handle,
 				     args->src_point, args->flags,
-				     &fence);
+				     &tmp);
 	if (ret)
 		goto err_put_timeline;
 
-	ret = drm_syncobj_flatten_chain(&fence);
-	if (ret)
-		goto err_free_fence;
+	fence = dma_fence_unwrap_merge(tmp);
+	dma_fence_put(tmp);
+	if (!fence)
+		goto err_put_timeline;
 
 	chain = dma_fence_chain_alloc();
 	if (!chain) {