powerpc/pseries: Checking for pdn->parent is redundant

The device tree root is never a pci bus, and will not have a
PCI_DN(pdn), so the check for PCI_DN added in
650f7b3b2f0ead0673e90452cf3dedde97c537ba makes the check for pdn->parent
redundant and it can be removed.

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, 1 insertions, 4 deletions

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 0dbadbb34f3a..dae3f8847117 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -530,10 +530,7 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
         }
         pr_debug("  parent is %s\n", pdn->full_name);
 
-        /* Check for parent == NULL so we don't try to setup the empty EADS
-         * slots on POWER4 machines.
-         */
-        if (dma_window == NULL || pdn->parent == NULL) {
+        if (dma_window == NULL) {
                 pr_debug("  no dma window for device, linking to parent\n");
                 set_iommu_table_base(&dev->dev, PCI_DN(pdn)->iommu_table);
                 return;