linux-kernel - Re: [PATCH v4 2/2] iommu/tegra-smmu: Expand mutex protection range

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Message-ID: <20201008095615.GC2349275@ulmo>
Date:   Thu, 8 Oct 2020 11:56:15 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     joro@...tes.org, vdumpa@...dia.com, jonathanh@...dia.com,
        digetx@...il.com, linux-tegra@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        hch@...radead.org
Subject: Re: [PATCH v4 2/2] iommu/tegra-smmu: Expand mutex protection range

On Mon, Sep 28, 2020 at 11:13:25PM -0700, Nicolin Chen wrote:
> This is used to protect potential race condition at use_count.
> since probes of client drivers, calling attach_dev(), may run
> concurrently.
> 
> Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
> ---
> 
> Changelog
> v3->v4:
>  * Fixed typo "Expend" => "Expand"
> v2->v3:
>  * Renamed label "err_unlock" to "unlock"
> v1->v2:
>  * N/A
> 
>  drivers/iommu/tegra-smmu.c | 34 +++++++++++++++++++++-------------
>  1 file changed, 21 insertions(+), 13 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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