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

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Date: Wed, 21 Feb 2024 17:22:24 +0800
From: Puma Hsu <pumahsu@...gle.com>
To: Greg KH <gregkh@...uxfoundation.org>
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 2:30 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> 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?  :)

Yes, this actually started from 2023, will fix it.

>
> > +     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.

Thank you for advising. Will review and handle it properly.

>
> > +MODULE_ALIAS("platform:xhci-hcd-goog");
>
> Why is this alias needed?  I thought that was only for older-style
> platform devices

I will change to module_platform_driver(). Thank you for advising.

>
> > +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