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    SubjectRe: [PATCH v4 15/20] iommu/tegra: gart: Allow only one active domain at a time
    On Mon, Sep 24, 2018 at 03:41:48AM +0300, Dmitry Osipenko wrote:
    > GART has a single address space that is shared by all devices, hence only
    > one domain could be active at a time.
    >
    > Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
    > ---
    > drivers/iommu/tegra-gart.c | 9 +++++++++
    > 1 file changed, 9 insertions(+)
    >
    > diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
    > index 1d45b023adea..9f7d3afb686f 100644
    > --- a/drivers/iommu/tegra-gart.c
    > +++ b/drivers/iommu/tegra-gart.c
    > @@ -55,6 +55,7 @@ struct gart_device {
    > spinlock_t pte_lock; /* for pagetable */
    > struct list_head client;
    > spinlock_t client_lock; /* for client list */
    > + struct iommu_domain *active_domain; /* current active domain */

    The active_ prefix seems a little unnecessary here, but either way:

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