powerpc/viobus: Free TCE table on device release

Release the TCE table as the XXX suggests, except on FW_FEATURE_ISERIES,
where the tables are allocated globally and reused.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 72db4b021762..d692989a4318 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -1184,7 +1184,12 @@ EXPORT_SYMBOL(vio_unregister_driver);
 /* vio_dev refcount hit 0 */
 static void __devinit vio_dev_release(struct device *dev)
 {
-        /* XXX should free TCE table */
+        struct iommu_table *tbl = get_iommu_table_base(dev);
+
+        /* iSeries uses a common table for all vio devices */
+        if (!firmware_has_feature(FW_FEATURE_ISERIES) && tbl)
+                iommu_free_table(tbl, dev->of_node ?
+                        dev->of_node->full_name : dev_name(dev));
         of_node_put(dev->of_node);
         kfree(to_vio_dev(dev));
 }