--- zzzz-none-000/linux-3.10.107/drivers/iommu/shmobile-iommu.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/drivers/iommu/shmobile-iommu.c	2021-11-10 11:53:55.000000000 +0000
@@ -380,14 +380,13 @@
 		kmem_cache_destroy(l1cache);
 		return -ENOMEM;
 	}
-	archdata = kmalloc(sizeof(*archdata), GFP_KERNEL);
+	archdata = kzalloc(sizeof(*archdata), GFP_KERNEL);
 	if (!archdata) {
 		kmem_cache_destroy(l1cache);
 		kmem_cache_destroy(l2cache);
 		return -ENOMEM;
 	}
 	spin_lock_init(&archdata->attach_lock);
-	archdata->attached = NULL;
 	archdata->ipmmu = ipmmu;
 	ipmmu_archdata = archdata;
 	bus_set_iommu(&platform_bus_type, &shmobile_iommu_ops);