platform/chrome: cros_ec_typec: add remove driver hook

This allows the driver to be unbound and bound again. Otherwise, when
unbinding the driver, there will be leftover sysfs entries.

When rebinding the driver, it also ends up touching freed memory when
adding to the notifier chain as the old one was not removed and ends up
being traversed.

Add a remove_new driver hook, which removes the notifier from the chain and
unregisters the typec ports.

Signed-off-by: Thadeu Lima de Souza Cascardo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Tzung-Bi Shih <[email protected]>

Author: Thadeu Lima de Souza Cascardo

drivers/platform/chrome/cros_ec_typec.c

@@ -1285,6 +1285,15 @@ static int cros_typec_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static void cros_typec_remove(struct platform_device *pdev)
+{
+	struct cros_typec_data *typec = platform_get_drvdata(pdev);
+
+	cros_usbpd_unregister_notify(&typec->nb);
+	cancel_work_sync(&typec->port_work);
+	cros_unregister_ports(typec);
+}
+
 static int __maybe_unused cros_typec_suspend(struct device *dev)
 {
 	struct cros_typec_data *typec = dev_get_drvdata(dev);
@@ -1316,6 +1325,7 @@ static struct platform_driver cros_typec_driver = {
 		.pm = &cros_typec_pm_ops,
 	},
 	.probe = cros_typec_probe,
+	.remove_new = cros_typec_remove,
 };
 
 module_platform_driver(cros_typec_driver);