greybus: interface: disable control connection on initialisation errors

Disable the control connection immediately on any errors during
interface initialisation as there's no need to keep it around for an
interface in an error state.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Jeffrey Carlyle <jcarlyle@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/interface.c

@@ -198,15 +198,20 @@ int gb_interface_init(struct gb_interface *intf)
 	size = gb_control_get_manifest_size_operation(intf);
 	if (size <= 0) {
 		dev_err(&intf->dev, "failed to get manifest size: %d\n", size);
+
 		if (size)
-			return size;
+			ret = size;
 		else
-			return -EINVAL;
+			ret =  -EINVAL;
+
+		goto err_disable_control;
 	}
 
 	manifest = kmalloc(size, GFP_KERNEL);
-	if (!manifest)
-		return -ENOMEM;
+	if (!manifest) {
+		ret = -ENOMEM;
+		goto err_disable_control;
+	}
 
 	/* Get manifest using control protocol on CPort */
 	ret = gb_control_get_manifest_operation(intf, manifest, size);
@@ -242,6 +247,8 @@ int gb_interface_init(struct gb_interface *intf)
 		gb_bundle_destroy(bundle);
 err_free_manifest:
 	kfree(manifest);
+err_disable_control:
+	gb_control_disable(intf->control);
 
 	return ret;
 }