[PATCH 03/16] Use of_get_next_parent() in pci_dma_bus_setup_pSeriesLP()

[Michael Ellerman]

pci_dma_bus_setup_pSeriesLP() should use of_get_next_parent() to safely
iterate through the parent nodes.

Signed-off-by: Michael Ellerman <michael at ellerman.id.au>
---
 arch/powerpc/platforms/pseries/iommu.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 83c0e0f..e2b325d 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -403,7 +403,7 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
 	DBG("pci_dma_bus_setup_pSeriesLP: setting up bus %s\n", dn->full_name);
 
 	/* Find nearest ibm,dma-window, walking up the device tree */
-	for (pdn = dn; pdn != NULL; pdn = pdn->parent) {
+	for (pdn = of_node_get(dn); pdn; pdn = of_get_next_parent(pdn)) {
 		dma_window = of_get_property(pdn, "ibm,dma-window", NULL);
 		if (dma_window != NULL)
 			break;
@@ -411,6 +411,7 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
 
 	if (dma_window == NULL) {
 		DBG("  no ibm,dma-window property !\n");
+		of_node_put(pdn);
 		return;
 	}
 
@@ -437,6 +438,8 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
 
 	if (pdn != dn)
 		PCI_DN(dn)->iommu_table = ppci->iommu_table;
+
+	of_node_put(pdn);
 }
 
 
-- 
1.5.2.rc1.1884.g59b20