Re: [PATCH] drm: fix call_kern.cocci warnings v2

["Koenig, Christian" <Christian.Koenig@xxxxxxx>]

Am 25.10.18 um 11:03 schrieb zhoucm1:

On 2018年10月25日 16:56, Christian König wrote:

+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -111,15 +111,16 @@ static struct dma_fence
                        uint64_t point)
  {
      struct drm_syncobj_signal_pt *signal_pt;
+    struct dma_fence *f = NULL;
+    struct drm_syncobj_stub_fence *fence =
+        kzalloc(sizeof(struct drm_syncobj_stub_fence),
+            GFP_KERNEL);
  +    if (!fence)
+        return NULL;
+    spin_lock(&syncobj->pt_lock);

How about using a single static stub fence like I suggested?

Sorry, I don't get your meanings, how to do that?

Add a new function drm_syncobj_stub_fence_init() which is called from drm_core_init() when the module is loaded.

In drm_syncobj_stub_fence_init() you initialize one static stub_fence which is then used over and over again.

Since its reference count never goes down to zero it should never be freed. In doubt maybe add a .free callback which just calls BUG() to catch reference count issues.

Christian.

Thanks,
David

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