But since we want to support hotplug it is rather problematic if that idev is permanently locked down. > Otherwise, iommu_probe_device_lock and iommu_device_lock in the > iommu.c are good enough to lock dev->iommu and iommu->list. And > I think we just need an iommu helper refcounting the dev_iommu > (or iommu_device) as we previously discussed. If you have a ref on an idev then the iommu_dev has to be stable, so you can just incr some refcount and then drop the idev stuff. Jason
