[RFC PATCH 5/9] PCI: rpaphp: don't rely on firmware feature to imply drc-info support

[Tyrel Datwyler]

In the event that the partition is migrated to a platform with older
firmware that doesn't support the ibm,drc-info property the device
tree is modified to remove the ibm,drc-info property and replace it
with the older style ibm,drc-* properties for types, names, indexes,
and power-domains. One of the requirements of the drc-info firmware
feature is the the client is able to handle both the new property,
and old properties. Therefore we can't rely on the firmware feature
alone to dictate which property is currently present in the device
tree.

Fix this short coming by checking explicitly for the ibm,drc-info
property, and falling back to the older ibm,drc-* properties if it
doesn't exist.

Signed-off-by: Tyrel Datwyler <tyreld at linux.ibm.com>
---
 drivers/pci/hotplug/rpaphp_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index e350264..e18e9a0 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -275,7 +275,7 @@ int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
 		return -EINVAL;
 	}
 
-	if (firmware_has_feature(FW_FEATURE_DRC_INFO))
+	if (of_find_property(dn->parent, "ibm,drc-info", NULL))
 		return rpaphp_check_drc_props_v2(dn, drc_name, drc_type,
 						*my_index);
 	else
-- 
2.7.4