greybus: connection: add control connection flag

Add control connection flag which will be set for control connections.

Also add a helper function to test if the flag is set.

Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/connection.c

@@ -227,7 +227,8 @@ gb_connection_create_static(struct gb_host_device *hd, u16 hd_cport_id,
 struct gb_connection *
 gb_connection_create_control(struct gb_interface *intf)
 {
-	return _gb_connection_create(intf->hd, -1, intf, NULL, 0, NULL, 0);
+	return _gb_connection_create(intf->hd, -1, intf, NULL, 0, NULL,
+					GB_CONNECTION_FLAG_CONTROL);
 }
 
 struct gb_connection *
@@ -412,11 +413,11 @@ static int gb_connection_control_connected(struct gb_connection *connection)
 		return 0;
 	}
 
-	control = connection->intf->control;
-
-	if (connection == control->connection)
+	if (gb_connection_is_control(connection))
 		return 0;
 
+	control = connection->intf->control;
+
 	ret = gb_control_connected_operation(control, cport_id);
 	if (ret) {
 		dev_err(&connection->bundle->dev,
@@ -438,11 +439,11 @@ gb_connection_control_disconnected(struct gb_connection *connection)
 	if (gb_connection_is_static(connection))
 		return;
 
-	control = connection->intf->control;
-
-	if (connection == control->connection)
+	if (gb_connection_is_control(connection))
 		return;
 
+	control = connection->intf->control;
+
 	ret = gb_control_disconnected_operation(control, cport_id);
 	if (ret) {
 		dev_warn(&connection->bundle->dev,

drivers/staging/greybus/connection.h

@@ -17,6 +17,7 @@
 #define GB_CONNECTION_FLAG_NO_FLOWCTRL	BIT(1)
 #define GB_CONNECTION_FLAG_OFFLOADED	BIT(2)
 #define GB_CONNECTION_FLAG_CDSI1	BIT(3)
+#define GB_CONNECTION_FLAG_CONTROL	BIT(4)
 
 enum gb_connection_state {
 	GB_CONNECTION_STATE_INVALID	= 0,
@@ -104,6 +105,11 @@ static inline bool gb_connection_is_offloaded(struct gb_connection *connection)
 	return connection->flags & GB_CONNECTION_FLAG_OFFLOADED;
 }
 
+static inline bool gb_connection_is_control(struct gb_connection *connection)
+{
+	return connection->flags & GB_CONNECTION_FLAG_CONTROL;
+}
+
 static inline void *gb_connection_get_data(struct gb_connection *connection)
 {
 	return connection->private;