linux-kernel - Re: [PATCH 2/3] usb: xhci: Add support for Google XHCI controller

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Date: Mon, 19 Feb 2024 07:30:33 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Puma Hsu <pumahsu@...gle.com>
Cc: mathias.nyman@...el.com, Thinh.Nguyen@...opsys.com, badhri@...gle.com,
	royluo@...gle.com, howardyen@...gle.com, albertccwang@...gle.com,
	raychi@...gle.com, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/3] usb: xhci: Add support for Google XHCI controller

On Mon, Feb 19, 2024 at 02:10:07PM +0800, Puma Hsu wrote:
> diff --git a/drivers/usb/host/xhci-goog.c b/drivers/usb/host/xhci-goog.c
> new file mode 100644
> index 000000000000..db027a5866db
> --- /dev/null
> +++ b/drivers/usb/host/xhci-goog.c
> @@ -0,0 +1,154 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * xhci-goog.c - xHCI host controller driver platform Bus Glue.
> + *
> + * Copyright (c) 2024 Google LLC

This code is older than 2024, right?  :)

> +	if (WARN_ON(!sysdev->dma_mask)) {

If this triggers, you just rebooted your device (as you run with
panic-on-warn enabled), so please, if this is something that can
actually happen, handle it properly and move on, don't reboot a device.

> +MODULE_ALIAS("platform:xhci-hcd-goog");

Why is this alias needed?  I thought that was only for older-style
platform devices

> +static int __init xhci_goog_init(void)
> +{
> +	return platform_driver_register(&usb_goog_xhci_driver);
> +}
> +module_init(xhci_goog_init);
> +
> +static void __exit xhci_goog_exit(void)
> +{
> +	platform_driver_unregister(&usb_goog_xhci_driver);
> +}
> +module_exit(xhci_goog_exit);

module_platform_driver()?

thanks,

greg k-h