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From 352824dfbfbff5328210e72402abe1a934113ce0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Tue, 15 Mar 2016 13:40:17 +0100
Subject: [PATCH 0396/1110] drm/amdgpu: RCU protected amdgpu_fence_release
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index d8bbe85..ec73ab1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -638,12 +638,33 @@ static bool amdgpu_fence_enable_signaling(struct fence *f)
return true;
}
-static void amdgpu_fence_release(struct fence *f)
+/**
+ * amdgpu_fence_free - free up the fence memory
+ *
+ * @rcu: RCU callback head
+ *
+ * Free up the fence memory after the RCU grace period.
+ */
+static void amdgpu_fence_free(struct rcu_head *rcu)
{
+ struct fence *f = container_of(rcu, struct fence, rcu);
struct amdgpu_fence *fence = to_amdgpu_fence(f);
kmem_cache_free(amdgpu_fence_slab, fence);
}
+/**
+ * amdgpu_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 amdgpu_fence_release(struct fence *f)
+{
+ call_rcu(&f->rcu, amdgpu_fence_free);
+}
+
static const struct fence_ops amdgpu_fence_ops = {
.get_driver_name = amdgpu_fence_get_driver_name,
.get_timeline_name = amdgpu_fence_get_timeline_name,
--
2.7.4
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