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powerpc/powernv: Reference iommu_table while it is linked to a group

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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 <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alexey Kardashevskiy 2018-12-19 19:52:23 +11:00 committed by Michael Ellerman
parent 5eada8a3f0
commit 847e6563aa
2 changed files with 2 additions and 5 deletions
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3
arch/powerpc/platforms/powernv/pci-ioda-tce.c
View File

@ -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(&tgl->next, &tbl->it_group_list);
table_group->tables[num] = tbl;
table_group->tables[num] = iommu_tce_table_get(tbl);
return 0;
}

4
arch/powerpc/platforms/powernv/pci-ioda.c
View File

@ -2714,10 +2714,6 @@ 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);
}