From ccd05d086f82dba2ab117dcaf4a38cbb2863a439 Mon Sep 17 00:00:00 2001 From: Michael Ellerman 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 Signed-off-by: Paul Mackerras --- 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 df330666cc..a276064471 100644 --- a/arch/powerpc/platforms/cell/iommu.c +++ b/arch/powerpc/platforms/cell/iommu.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include @@ -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) { -- 2.39.5