[PATCH 1/1] one mmap offset allow per object per file

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_mman.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 4f69bff63068..be6be6424806 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -696,8 +696,12 @@ mmap_offset_attach(struct drm_i915_gem_object *obj,
 	mmo = insert_mmo(obj, mmo);
 	GEM_BUG_ON(lookup_mmo(obj, mmap_type) != mmo);
 out:
-	if (file)
-		drm_vma_node_allow(&mmo->vma_node, file);
+	if (file) {
+		spin_lock(&obj->mmo.lock);
+		if (!drm_vma_node_is_allowed(&mmo->vma_node, file))
+			drm_vma_node_allow(&mmo->vma_node, file);
+		spin_unlock(&obj->mmo.lock);
+	}
 	return mmo;
 
 err:
-- 
2.34.1