diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c
index 63875761dfac..e29823ae8672 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c
@@ -469,6 +469,7 @@ amdgpu_userq_get_doorbell_index(struct amdgpu_userq_mgr *uq_mgr,
 	u64 doorbell_index;
 	struct drm_gem_object *gobj;
 	struct amdgpu_userq_obj *db_obj = db_info->db_obj;
+	struct amdgpu_bo *abo;
 	int r, db_size;
 
 	gobj = drm_gem_object_lookup(filp, db_info->doorbell_handle);
@@ -477,7 +478,17 @@ amdgpu_userq_get_doorbell_index(struct amdgpu_userq_mgr *uq_mgr,
 		return -EINVAL;
 	}
 
-	db_obj->obj = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
+	/*
+	 * Pinning a regular BO into the doorbell domain would discard its
+	 * contents, possibly those of a buffer shared by another client.
+	 */
+	abo = gem_to_amdgpu_bo(gobj);
+	if (!(abo->preferred_domains & AMDGPU_GEM_DOMAIN_DOORBELL)) {
+		drm_gem_object_put(gobj);
+		return -EINVAL;
+	}
+
+	db_obj->obj = amdgpu_bo_ref(abo);
 	drm_gem_object_put(gobj);
 
 	r = amdgpu_bo_reserve(db_obj->obj, true);