[CELL] allow linux to map Cell regs on legacy SLOF tree.

The platforms missing the "cpus" property in the "be" node are mono-Cell
platforms such as CAB or Getaway.

Therefore it is possible to assume that if there is no "cpus" properties
under the "be" node then we can safely return the "device node" without
more checking. This is a bit hacky but ... it allows it to work on
these platforms.

Signed-off-by: Jean-Christophe DUBOIS <jcd@tribudubois.net>
Acked-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

diff --git a/arch/powerpc/platforms/cell/cbe_regs.c b/arch/powerpc/platforms/cell/cbe_regs.c
index 12c9674b4b1f27d51f20f590613a7f1afb1273be..c8f7f000742216a3a3f87852c6844e4c85b255b0 100644 (file)
--- a/arch/powerpc/platforms/cell/cbe_regs.c
+++ b/arch/powerpc/platforms/cell/cbe_regs.c
@@ -174,6 +174,13 @@ static struct device_node *cbe_get_be_node(int cpu_id)
 
                cpu_handle = of_get_property(np, "cpus", &len);
 
+               /*
+                * the CAB SLOF tree is non compliant, so we just assume
+                * there is only one node
+                */
+               if (WARN_ON_ONCE(!cpu_handle))
+                       return np;
+
                for (i=0; i<len; i++)
                        if (of_find_node_by_phandle(cpu_handle[i]) == of_get_cpu_node(cpu_id, NULL))
                                return np;