of/flattree: Make the kernel accept ePAPR style phandle information

Currently when processing flattened device trees, the kernel expects the phandle in a property called "linux,phandle". The ePAPR spec - not being Linux specific - instead requires phandles to be encoded in a property named simply "phandle". This patch makes the kernel accept either form when unflattening the device tree. Signed-off-by: David Gibson <[email protected]> Signed-off-by: Grant Likely <[email protected]>
kishon · Feb 9, 2010 · 04b954a · 04b954a
1 parent 087f79c
commit 04b954a
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
@@ -310,10 +310,19 @@ unsigned long __init unflatten_dt_node(unsigned long mem,
 		pp = unflatten_dt_alloc(&mem, sizeof(struct property),
 					__alignof__(struct property));
 		if (allnextpp) {
-			if (strcmp(pname, "linux,phandle") == 0) {
+			/* We accept flattened tree phandles either in
+			 * ePAPR-style "phandle" properties, or the
+			 * legacy "linux,phandle" properties.  If both
+			 * appear and have different values, things
+			 * will get weird.  Don't do that. */
+			if ((strcmp(pname, "phandle") == 0) ||
+			    (strcmp(pname, "linux,phandle") == 0)) {
 				if (np->phandle == 0)
 					np->phandle = *((u32 *)*p);
 			}
+			/* And we process the "ibm,phandle" property
+			 * used in pSeries dynamic device tree
+			 * stuff */
 			if (strcmp(pname, "ibm,phandle") == 0)
 				np->phandle = *((u32 *)*p);
 			pp->name = pname;