linux-kernel - Re: [PATCH v4 02/13] driver core: Set DMA ownership during driver bind/unbind

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Message-ID: <20211231003656.GA2327632@nvidia.com>
Date:   Thu, 30 Dec 2021 20:36:56 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Dan Williams <dan.j.williams@...el.com>, rafael@...nel.org,
        Diana Craciun <diana.craciun@....nxp.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Li Yang <leoyang.li@....com>,
        Dmitry Osipenko <digetx@...il.com>,
        iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 02/13] driver core: Set DMA ownership during driver
 bind/unbind

On Thu, Dec 23, 2021 at 03:23:54PM +0800, Lu Baolu wrote:

> > If this is a bug in the existing kernel, please submit it as a separate
> > patch so that it can be properly backported to all affected kernels.
> > Never bury it in an unrelated change that will never get sent to older
> > kernels.
> 
> Sure! I will. Thank you!

I recall looking at this some time ago, and yes the ordering is not in
the strict pairwise error unwind one would expect, the extra calls
turned out to be harmless. Do check carefully..

Jason