[PATCH] Driver Core: handle bridged platform bus segments

During setup to access platform bus segments through bridges, the current
platform_device_register() ignores the resource parent specified by the
bridge.  That means it'll always detect a (false) resource conflict with
the bridge, and fail the resource reservation step.

This patch makes that code use the specified parent resource, defaulting
to "iomem_resource" or "ioport_resource" only for a NULL parent (that is,
for devices that aren't accessed through a bridge).
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/base/platform.c

@@ -141,11 +141,13 @@ int platform_device_register(struct platform_device * pdev)
 		if (r->name == NULL)
 			r->name = pdev->dev.bus_id;
 
-		p = NULL;
-		if (r->flags & IORESOURCE_MEM)
-			p = &iomem_resource;
-		else if (r->flags & IORESOURCE_IO)
-			p = &ioport_resource;
+		p = r->parent;
+		if (!p) {
+			if (r->flags & IORESOURCE_MEM)
+				p = &iomem_resource;
+			else if (r->flags & IORESOURCE_IO)
+				p = &ioport_resource;
+		}
 
 		if (p && request_resource(p, r)) {
 			printk(KERN_ERR