linux-kernel - Re: [PATCH v5 5/9] iommu/arm-smmu-v3: Refactor write_ctx

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Message-ID: <CAKHBV27iMDaU3RgJSVFva0UBmyKD8oJEtzDU7PJ4LuPGWAjCCA@mail.gmail.com>
Date:   Tue, 15 Aug 2023 13:04:43 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     Will Deacon <will@...nel.org>
Cc:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, robin.murphy@....com,
        nicolinc@...dia.com, jgg@...dia.com, jean-philippe@...aro.org
Subject: Re: [PATCH v5 5/9] iommu/arm-smmu-v3: Refactor write_ctx_desc

On Thu, Aug 10, 2023 at 5:15 PM Michael Shavit <mshavit@...gle.com> wrote:
> On Wed, Aug 9, 2023 at 9:50 PM Will Deacon <will@...nel.org> wrote:
> >
> > Since you're dropping this and relying on the lock being taken higher up
> > callstack, can we add a lockdep assertion that we do actually hold the
> > devices_lock, please?
>
> Will do!

I spoke too soon; the point of this change was to remove the
dependency on the arm_smmu_domain, piping the devices_lock would
defeat this. In fact, this section is really depending on the iommu
group lock not the devices_lock.