Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership management

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Subject: Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership management
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 14 Dec 2021 08:35:36 -0800
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Ashok Raj <ashok.raj@xxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, rafael@xxxxxxxxxx, Diana Craciun <diana.craciun@xxxxxxxxxxx>, Cornelia Huck <cohuck@xxxxxxxxxx>, Eric Auger <eric.auger@xxxxxxxxxx>, Liu Yi L <yi.l.liu@xxxxxxxxx>, Jacob jun Pan <jacob.jun.pan@xxxxxxxxx>, Chaitanya Kulkarni <kch@xxxxxxxxxx>, Stuart Yoder <stuyoder@xxxxxxxxx>, Laurentiu Tudor <laurentiu.tudor@xxxxxxx>, Thierry Reding <thierry.reding@xxxxxxxxx>, David Airlie <airlied@xxxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>, Jonathan Hunter <jonathanh@xxxxxxxxxx>, Li Yang <leoyang.li@xxxxxxx>, Dmitry Osipenko <digetx@xxxxxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <b42ffaee-bb96-6db4-8540-b399214f6881@linux.intel.com>
References: <20211206015903.88687-1-baolu.lu@linux.intel.com> <20211206015903.88687-5-baolu.lu@linux.intel.com> <Ya4f662Af+8kE2F/@infradead.org> <20211206150647.GE4670@nvidia.com> <56a63776-48ca-0d6e-c25c-016dc016e0d5@linux.intel.com> <20211207131627.GA6385@nvidia.com> <c170d215-6aef-ff21-8733-1bae4478e39c@linux.intel.com> <b42ffaee-bb96-6db4-8540-b399214f6881@linux.intel.com>

This approach looks much better to me.

References:
- [PATCH v3 00/18] Fix BUG_ON in vfio_iommu_group_notifier()
  - From: Lu Baolu
- [PATCH v3 04/18] driver core: platform: Add driver dma ownership management
  - From: Lu Baolu
- Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership management
  - From: Christoph Hellwig
- Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership management
  - From: Jason Gunthorpe
- Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership management
  - From: Lu Baolu
- Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership management
  - From: Jason Gunthorpe
- Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership management
  - From: Lu Baolu
- Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership management
  - From: Lu Baolu

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