[PATCH 2/4] Don't enable cell IOMMU fixed mapping if there are no dma-ranges

[Michael Ellerman]

In order for the cell IOMMU fixed mapping to work we need "dma-ranges"
properties in the device tree. If there are none then there's no point
enabling the fixed mapping support.

Signed-off-by: Michael Ellerman <michael at ellerman.id.au>
---
 arch/powerpc/platforms/cell/iommu.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index a276064..1f7b254 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -917,6 +917,18 @@ static int __init cell_iommu_fixed_mapping_init(void)
 		return -1;
 	}
 
+	/* We must have dma-ranges properties for fixed mapping to work */
+	for (np = NULL; (np = of_find_all_nodes(np));) {
+		if (of_find_property(np, "dma-ranges", NULL))
+			break;
+	}
+	of_node_put(np);
+
+	if (!np) {
+		pr_debug("iommu: no dma-ranges found, no fixed mapping\n");
+		return -1;
+	}
+
 	/* The default setup is to have the fixed mapping sit after the
 	 * dynamic region, so find the top of the largest IOMMU window
 	 * on any axon, then add the size of RAM and that's our max value.
-- 
1.5.2.rc1.1884.g59b20