From ccd05d086f82dba2ab117dcaf4a38cbb2863a439 Mon Sep 17 00:00:00 2001
From: Michael Ellerman <michael@ellerman.id.au>
Date: Fri, 8 Feb 2008 16:37:02 +1100
Subject: [PATCH] [POWERPC] Fix cell IOMMU null pointer explosion on old
firmwares
The cell IOMMU fixed mapping support has a null pointer bug if you run
it on older firmwares that don't contain the "dma-ranges" properties.
Fix it and convert to using of_get_next_parent() while we're there.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---
arch/powerpc/platforms/cell/iommu.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index df330666ccc9c..a276064471b3a 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -26,6 +26,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
+#include <linux/of.h>
#include <linux/of_platform.h>
#include <asm/prom.h>
@@ -789,18 +790,16 @@ static int __init cell_iommu_init_disabled(void)
static u64 cell_iommu_get_fixed_address(struct device *dev)
{
u64 cpu_addr, size, best_size, pci_addr = OF_BAD_ADDR;
- struct device_node *tmp, *np;
+ struct device_node *np;
const u32 *ranges = NULL;
int i, len, best;
- np = dev->archdata.of_node;
- of_node_get(np);
- ranges = of_get_property(np, "dma-ranges", &len);
- while (!ranges && np) {
- tmp = of_get_parent(np);
- of_node_put(np);
- np = tmp;
+ np = of_node_get(dev->archdata.of_node);
+ while (np) {
ranges = of_get_property(np, "dma-ranges", &len);
+ if (ranges)
+ break;
+ np = of_get_next_parent(np);
}
if (!ranges) {
--
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