> From: Nicolin Chen
> Sent: Thursday, June 16, 2022 8:03 AM
> 
> All devices in emulated_iommu_groups have pinned_page_dirty_scope
> set, so the update_dirty_scope in the first list_for_each_entry
> is always false. Clean it up, and move the "if update_dirty_scope"
> part from the detach_group_done routine to the domain_list part.
> 
> Rename the "detach_group_done" goto label accordingly.
> 
> Suggested-by: Jason Gunthorpe <j...@nvidia.com>
> Signed-off-by: Nicolin Chen <nicol...@nvidia.com>

Reviewed-by: Kevin Tian <kevin.t...@intel.com>, with one nit:

> @@ -2469,7 +2467,7 @@ static void vfio_iommu_type1_detach_group(void
> *iommu_data,
>                       WARN_ON(iommu->notifier.head);
>                       vfio_iommu_unmap_unpin_all(iommu);
>               }
> -             goto detach_group_done;
> +             goto out_unlock;
...
> +out_unlock:
>       mutex_unlock(&iommu->lock);
>  }
> 

I'd just replace the goto with a direct unlock and then return there. 
the readability is slightly better.

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