drm/amdgpu: RCU protected amd_sched_fence_release

Fences must be freed RCU protected, otherwise the reservation_object_*_rcu()
functions can run into problems.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/scheduler/sched_fence.c b/drivers/gpu/drm/amd/scheduler/sched_fence.c
index 87c78eecea649a2112035db7fb66bb467cf6f457..dc115aea352bc9771e30605ab9c83f90f03e8df8 100644 (file)
--- a/drivers/gpu/drm/amd/scheduler/sched_fence.c
+++ b/drivers/gpu/drm/amd/scheduler/sched_fence.c
@@ -84,12 +84,33 @@ static bool amd_sched_fence_enable_signaling(struct fence *f)
        return true;
 }
 
-static void amd_sched_fence_release(struct fence *f)
+/**
+ * amd_sched_fence_free - free up the fence memory
+ *
+ * @rcu: RCU callback head
+ *
+ * Free up the fence memory after the RCU grace period.
+ */
+static void amd_sched_fence_free(struct rcu_head *rcu)
 {
+       struct fence *f = container_of(rcu, struct fence, rcu);
        struct amd_sched_fence *fence = to_amd_sched_fence(f);
        kmem_cache_free(sched_fence_slab, fence);
 }
 
+/**
+ * amd_sched_fence_release - callback that fence can be freed
+ *
+ * @fence: fence
+ *
+ * This function is called when the reference count becomes zero.
+ * It just RCU schedules freeing up the fence.
+ */
+static void amd_sched_fence_release(struct fence *f)
+{
+       call_rcu(&f->rcu, amd_sched_fence_free);
+}
+
 const struct fence_ops amd_sched_fence_ops = {
        .get_driver_name = amd_sched_fence_get_driver_name,
        .get_timeline_name = amd_sched_fence_get_timeline_name,