linux-kernel - Re: [PATCH RESEND v3] iommu/tegra-smmu: Add missing locks around mapping operations

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Date:   Fri, 4 Sep 2020 11:05:19 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v3] iommu/tegra-smmu: Add missing locks around
 mapping operations

On Fri, Aug 14, 2020 at 07:22:52PM +0300, Dmitry Osipenko wrote:
> The mapping operations of the Tegra SMMU driver are subjected to a race
> condition issues because SMMU Address Space isn't allocated and freed
> atomically, while it should be. This patch makes the mapping operations
> atomic, it fixes an accidentally released Host1x Address Space problem
> which happens while running multiple graphics tests in parallel on
> Tegra30, i.e. by having multiple threads racing with each other in the
> Host1x's submission and completion code paths, performing IOVA mappings
> and unmappings in parallel.
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

Thierry, does this change look good to you?