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@gmail.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@nvidia.com>