greybus: connection: separate connection creation and enabling

Separate connection creation from enabling.

This will ultimately allow connection structures to be created while
parsing manifests, but the connections to not be enabled until a driver
is bound.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/connection.c

@@ -14,7 +14,6 @@
 
 static int gb_connection_bind_protocol(struct gb_connection *connection);
 static void gb_connection_unbind_protocol(struct gb_connection *connection);
-static int gb_connection_init(struct gb_connection *connection);
 
 
 static DEFINE_SPINLOCK(gb_connections_lock);
@@ -125,7 +124,6 @@ gb_connection_create(struct gb_host_device *hd, int hd_cport_id,
 	struct gb_connection *connection;
 	struct ida *id_map = &hd->cport_id_map;
 	int ida_start, ida_end;
-	int retval;
 	u8 major = 0;
 	u8 minor = 1;
 
@@ -194,14 +192,6 @@ gb_connection_create(struct gb_host_device *hd, int hd_cport_id,
 
 	spin_unlock_irq(&gb_connections_lock);
 
-	retval = gb_connection_init(connection);
-	if (retval) {
-		dev_err(&hd->dev, "%s: failed to initialize connection: %d\n",
-			connection->name, retval);
-		gb_connection_destroy(connection);
-		return NULL;
-	}
-
 	return connection;
 
 err_free_connection:
@@ -396,7 +386,7 @@ static int gb_connection_protocol_get_version(struct gb_connection *connection)
 	return 0;
 }
 
-static int gb_connection_init(struct gb_connection *connection)
+int gb_connection_init(struct gb_connection *connection)
 {
 	int ret;
 

drivers/staging/greybus/connection.h

@@ -63,6 +63,8 @@ static inline bool gb_connection_is_static(struct gb_connection *connection)
 	return !connection->intf;
 }
 
+int gb_connection_init(struct gb_connection *connection);
+
 void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id,
 			u8 *data, size_t length);
 

drivers/staging/greybus/hd.c

@@ -124,6 +124,13 @@ int gb_hd_add(struct gb_host_device *hd)
 		return ret;
 	}
 
+	ret = gb_connection_init(hd->svc_connection);
+	if (ret) {
+		gb_connection_destroy(hd->svc_connection);
+		device_del(&hd->dev);
+		return ret;
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(gb_hd_add);

drivers/staging/greybus/interface.c

@@ -180,6 +180,12 @@ int gb_interface_init(struct gb_interface *intf, u8 device_id)
 		return -ENOMEM;
 	}
 
+	ret = gb_connection_init(connection);
+	if (ret) {
+		gb_connection_destroy(connection);
+		return ret;
+	}
+
 	/* Get manifest size using control protocol on CPort */
 	size = gb_control_get_manifest_size_operation(intf);
 	if (size <= 0) {

drivers/staging/greybus/manifest.c

@@ -228,6 +228,7 @@ static char *gb_string_get(struct gb_interface *intf, u8 string_id)
  */
 static u32 gb_manifest_parse_cports(struct gb_bundle *bundle)
 {
+	struct gb_connection *connection;
 	struct gb_interface *intf = bundle->intf;
 	struct manifest_desc *desc;
 	struct manifest_desc *next;
@@ -235,6 +236,7 @@ static u32 gb_manifest_parse_cports(struct gb_bundle *bundle)
 	u8 protocol_id;
 	u16 cport_id;
 	u32 count = 0;
+	int ret;
 
 	/* Set up all cport descriptors associated with this bundle */
 	list_for_each_entry_safe(desc, next, &intf->manifest_descs, links) {
@@ -254,10 +256,18 @@ static u32 gb_manifest_parse_cports(struct gb_bundle *bundle)
 		/* Found one.  Set up its function structure */
 		protocol_id = desc_cport->protocol_id;
 
-		if (!gb_connection_create_dynamic(intf, bundle, cport_id,
-								protocol_id))
+		connection = gb_connection_create_dynamic(intf, bundle,
+								cport_id,
+								protocol_id);
+		if (!connection)
 			goto exit;
 
+		ret = gb_connection_init(connection);
+		if (ret) {
+			gb_connection_destroy(connection);
+			goto exit;
+		}
+
 		count++;
 
 		/* Release the cport descriptor */