drm: use new iterator in drm_gem_fence_array_add_implicit v3

Simplifying the code a bit.

v2: add missing rcu_read_lock()/unlock()
v3: switch to locked version

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211005113742.1101-24-christian.koenig@amd.com

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 09c8200..4dcdec6 100644 (file)
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1340,31 +1340,15 @@ int drm_gem_fence_array_add_implicit(struct xarray *fence_array,
                                     struct drm_gem_object *obj,
                                     bool write)
 {
-       int ret;
-       struct dma_fence **fences;
-       unsigned int i, fence_count;
-
-       if (!write) {
-               struct dma_fence *fence =
-                       dma_resv_get_excl_unlocked(obj->resv);
-
-               return drm_gem_fence_array_add(fence_array, fence);
-       }
+       struct dma_resv_iter cursor;
+       struct dma_fence *fence;
+       int ret = 0;
 
-       ret = dma_resv_get_fences(obj->resv, NULL,
-                                               &fence_count, &fences);
-       if (ret || !fence_count)
-               return ret;
-
-       for (i = 0; i < fence_count; i++) {
-               ret = drm_gem_fence_array_add(fence_array, fences[i]);
+       dma_resv_for_each_fence(&cursor, obj->resv, write, fence) {
+               ret = drm_gem_fence_array_add(fence_array, fence);
                if (ret)
                        break;
        }
-
-       for (; i < fence_count; i++)
-               dma_fence_put(fences[i]);
-       kfree(fences);
        return ret;
 }
 EXPORT_SYMBOL(drm_gem_fence_array_add_implicit);