greybus: only initialize interfaces when up

Rather than bringing up all interfaces described in the manifest,
wait until we get a link up message, and at that time go initialize
the link.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/ap.c

@@ -126,7 +126,7 @@ static void svc_management(struct svc_function_unipro_management *management,
 			   int payload_length, struct greybus_host_device *hd)
 {
 	struct gb_module *module;
-	struct gb_interface *interface;
+	int ret;
 
 	if (payload_length != sizeof(struct svc_function_unipro_management)) {
 		dev_err(hd->parent,
@@ -143,15 +143,14 @@ static void svc_management(struct svc_function_unipro_management *management,
 				management->link_up.module_id);
 			return;
 		}
-		interface = gb_interface_find(module,
-					      management->link_up.interface_id);
-		if (!interface) {
-			dev_err(hd->parent, "Interface ID %d not found\n",
+		ret = gb_module_interface_init(module,
+				management->link_up.interface_id,
+				management->link_up.device_id);
+		if (ret)
+			dev_err(hd->parent, "error %d initializing"
+				"module %hhu interface %hhu\n",
+				ret, management->link_up.module_id,
 				management->link_up.interface_id);
-			return;
-		}
-		interface->device_id = management->link_up.device_id;
-		(void)svc_set_route_send(interface, hd);
 		break;
 	case SVC_MANAGEMENT_AP_DEVICE_ID:
 		hd->device_id = management->ap_device_id.device_id;

drivers/staging/greybus/core.c

@@ -181,8 +181,6 @@ void gb_add_module(struct greybus_host_device *hd, u8 module_id,
 	if (retval)
 		goto err_device;
 
-	gb_module_interfaces_init(gmod);
-
 	return;
 err_device:
 	put_device(&gmod->dev);

drivers/staging/greybus/module.c

@@ -118,15 +118,25 @@ struct gb_module *gb_module_find(struct greybus_host_device *hd, u8 module_id)
 	return NULL;
 }
 
-void gb_module_interfaces_init(struct gb_module *gmod)
+int
+gb_module_interface_init(struct gb_module *gmod, u8 interface_id, u8 device_id)
 {
 	struct gb_interface *interface;
-	int ret = 0;
+	int ret;
 
-	list_for_each_entry(interface, &gmod->interfaces, links) {
-		ret = gb_interface_connections_init(interface);
-		if (ret)
-			dev_err(gmod->hd->parent,
-				"module interface init error %d\n", ret);
+	interface = gb_interface_find(gmod, interface_id);
+	if (!interface) {
+		dev_err(gmod->hd->parent, "module %hhu not found\n",
+			interface_id);
+		return -ENOENT;
 	}
+	ret = gb_interface_connections_init(interface);
+	if (ret) {
+		dev_err(gmod->hd->parent, "module interface init error %d\n",
+			ret);
+		return ret;
+	}
+	interface->device_id = device_id;
+
+	return svc_set_route_send(interface, gmod->hd);
 }

drivers/staging/greybus/module.h

@@ -55,6 +55,7 @@ void gb_module_destroy(struct gb_module *module);
 struct gb_module *gb_module_find(struct greybus_host_device *hd,
 				u8 module_id);
 
-void gb_module_interfaces_init(struct gb_module *gmod);
+int gb_module_interface_init(struct gb_module *gmod, u8 module_id,
+				u8 device_id);
 
 #endif /* __MODULE_H */