staging: greybus: add host device function pointer checks

Add sanity checks for cport_quiesce and cport_clear before invoking the
callbacks as these function pointers are not required during the host
device registration. This follows the logic implemented elsewhere for
various other function pointers.

Signed-off-by: Jason Hrycay <[email protected]>
Reviewed-by: Bryan O'Donoghue <[email protected]>
Acked-by: Johan Hovold <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: jhrycay

drivers/staging/greybus/connection.c

@@ -357,6 +357,9 @@ static int gb_connection_hd_cport_quiesce(struct gb_connection *connection)
 	size_t peer_space;
 	int ret;
 
+	if (!hd->driver->cport_quiesce)
+		return 0;
+
 	peer_space = sizeof(struct gb_operation_msg_hdr) +
 			sizeof(struct gb_cport_shutdown_request);
 
@@ -380,6 +383,9 @@ static int gb_connection_hd_cport_clear(struct gb_connection *connection)
 	struct gb_host_device *hd = connection->hd;
 	int ret;
 
+	if (!hd->driver->cport_clear)
+		return 0;
+
 	ret = hd->driver->cport_clear(hd, connection->hd_cport_id);
 	if (ret) {
 		dev_err(&hd->dev, "%s: failed to clear host cport: %d\n",