usb: typec: ucsi: Don't attempt to resume the ports before they exist

This will fix null pointer dereference that was caused by
the driver attempting to resume ports that were not yet
registered.

Fixes: e0dced9 ("usb: typec: ucsi: Resume in separate work")
Cc: <[email protected]>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216697
Signed-off-by: Heikki Krogerus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Heikki Krogerus

drivers/usb/typec/ucsi/ucsi.c

@@ -1269,6 +1269,9 @@ static int ucsi_init(struct ucsi *ucsi)
 		con->port = NULL;
 	}
 
+	kfree(ucsi->connector);
+	ucsi->connector = NULL;
+
 err_reset:
 	memset(&ucsi->cap, 0, sizeof(ucsi->cap));
 	ucsi_reset_ppm(ucsi);
@@ -1300,7 +1303,8 @@ static void ucsi_resume_work(struct work_struct *work)
 
 int ucsi_resume(struct ucsi *ucsi)
 {
-	queue_work(system_long_wq, &ucsi->resume_work);
+	if (ucsi->connector)
+		queue_work(system_long_wq, &ucsi->resume_work);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(ucsi_resume);
@@ -1420,6 +1424,9 @@ void ucsi_unregister(struct ucsi *ucsi)
 	/* Disable notifications */
 	ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd));
 
+	if (!ucsi->connector)
+		return;
+
 	for (i = 0; i < ucsi->cap.num_connectors; i++) {
 		cancel_work_sync(&ucsi->connector[i].work);
 		ucsi_unregister_partner(&ucsi->connector[i]);