[PATCH v5 09/29] iommufd: Do not unmap an owned iopt_area

[Nicolin Chen]

On Wed, May 28, 2025 at 02:08:45PM -0300, Jason Gunthorpe wrote:
> @@ -740,11 +740,16 @@ static int iopt_unmap_iova_range(struct io_pagetable *iopt, unsigned long start,
>  			up_write(&iopt->iova_rwsem);
>  			up_read(&iopt->domains_rwsem);
>  
> -			iommufd_access_notify_unmap(iopt, area_first, length);
> +			rc = iommufd_access_notify_unmap(iopt, area_first, length);
> +			if (rc)
> +				goto out_unmapped;
> +

I found that we have to re-take those rwsems to unset a flag:

			rc = iommufd_access_notify_unmap(iopt, area_first, length);
			if (rc) {
				down_read(&iopt->domains_rwsem);
  				down_write(&iopt->iova_rwsem);
				area->prevent_access = false;
				goto out_unlock_iova;
			}

Will include this in the patch.

Thanks
Nicolin