drm/i915: use the new iterator in i915_request_await_object v2

Simplifying the code a bit.

v2: add missing rcu_read_lock()/rcu_read_unlock()
v3: use dma_resv_for_each_fence instead

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211005113742.1101-20-christian.koenig@amd.com

diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index ce44671..3839712 100644 (file)
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1509,38 +1509,14 @@ i915_request_await_object(struct i915_request *to,
                          struct drm_i915_gem_object *obj,
                          bool write)
 {
-       struct dma_fence *excl;
+       struct dma_resv_iter cursor;
+       struct dma_fence *fence;
        int ret = 0;
 
-       if (write) {
-               struct dma_fence **shared;
-               unsigned int count, i;
-
-               ret = dma_resv_get_fences(obj->base.resv, &excl, &count,
-                                         &shared);
+       dma_resv_for_each_fence(&cursor, obj->base.resv, write, fence) {
+               ret = i915_request_await_dma_fence(to, fence);
                if (ret)
-                       return ret;
-
-               for (i = 0; i < count; i++) {
-                       ret = i915_request_await_dma_fence(to, shared[i]);
-                       if (ret)
-                               break;
-
-                       dma_fence_put(shared[i]);
-               }
-
-               for (; i < count; i++)
-                       dma_fence_put(shared[i]);
-               kfree(shared);
-       } else {
-               excl = dma_resv_get_excl_unlocked(obj->base.resv);
-       }
-
-       if (excl) {
-               if (ret == 0)
-                       ret = i915_request_await_dma_fence(to, excl);
-
-               dma_fence_put(excl);
+                       break;
        }
 
        return ret;