RE: [PATCH v3 01/11] iommu/vt-d: debugfs: Remove device_domain_lock usage

[Tian, Kevin]

> From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Wednesday, June 29, 2022 3:47 PM
> 
> The domain_translation_struct debugfs node is used to dump the DMAR
> page
> tables for the PCI devices. It potentially races with setting domains to
> devices. The existing code uses the global spinlock device_domain_lock to
> avoid the races.
> 
> This removes the use of device_domain_lock outside of iommu.c by replacing
> it with the group mutex lock. Using the group mutex lock is cleaner and
> more compatible to following cleanups.
> 
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>