On Tue, Nov 13, 2018 at 07:28:16PM +1100, Alexey Kardashevskiy wrote:
> The iommu_table pointer stored in iommu_table_group may get stale
> by accident, this adds referencing and removes a redundant comment
> about this.
>
> Signed-off-by: Alexey Kardashevskiy
Reviewed-by: David Gibson
> ---
> arch/powerpc/platforms/powernv/pci-ioda-tce.c | 3 ++-
> arch/powerpc/platforms/powernv/pci-ioda.c | 4
> 2 files changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda-tce.c
> b/arch/powerpc/platforms/powernv/pci-ioda-tce.c
> index 7639b21..697449a 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda-tce.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda-tce.c
> @@ -368,6 +368,7 @@ void pnv_pci_unlink_table_and_group(struct iommu_table
> *tbl,
> found = false;
> for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
> if (table_group->tables[i] == tbl) {
> + iommu_tce_table_put(tbl);
> table_group->tables[i] = NULL;
> found = true;
> break;
> @@ -393,7 +394,7 @@ long pnv_pci_link_table_and_group(int node, int num,
> tgl->table_group = table_group;
> list_add_rcu(>next, >it_group_list);
>
> - table_group->tables[num] = tbl;
> + table_group->tables[num] = iommu_tce_table_get(tbl);
>
> return 0;
> }
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c
> b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 7f4904a..7caf373 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -2716,10 +2716,6 @@ static long pnv_pci_ioda2_npu_unset_window(
>
> static void pnv_ioda2_npu_take_ownership(struct iommu_table_group
> *table_group)
> {
> - /*
> - * Detach NPU first as pnv_ioda2_take_ownership() will destroy
> - * the iommu_table if 32bit DMA is enabled.
> - */
> pnv_npu_take_ownership(gpe_table_group_to_npe(table_group));
> pnv_ioda2_take_ownership(table_group);
> }
--
David Gibson| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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