linux-kernel - Re: [PATCH] usb: xhci: Add module param for compliance quirk checking

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Message-ID: <2024120205-collected-trapezoid-9dde@gregkh>
Date: Mon, 2 Dec 2024 07:38:11 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: xiehongyu1@...inos.cn
Cc: mathias.nyman@...el.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: xhci: Add module param for compliance quirk checking

On Mon, Dec 02, 2024 at 11:18:55AM +0800, xiehongyu1@...inos.cn wrote:
> From: Hongyu Xie <xiehongyu1@...inos.cn>
> 
> In the old way, vendor name and product name need to be put in
> xhci_compliance_mode_recovery_timer_quirk_check, it's not convenient.
> 
> So add two module param for convenience.

Please no.  Module parameters are from the 1990's, they do not scale or
work well anymore, please never add them.

> 
> usage: put xhci-hcd.compliance_vendor=[vendor name]
> xhci-hcd.compliance_product=[product name] in cmdline.
> 
> In Ubuntu you can use "dmidecode -t system" to get vendor name and
> product name.
> 
> Signed-off-by: Hongyu Xie <xiehongyu1@...inos.cn>
> ---
>  drivers/usb/host/xhci.c | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 5ebde8cae4fc..2007c27bfaf4 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -39,6 +39,14 @@ static unsigned long long quirks;
>  module_param(quirks, ullong, S_IRUGO);
>  MODULE_PARM_DESC(quirks, "Bit flags for quirks to be enabled as default");
>  
> +static char *compliance_product;
> +module_param(compliance_product, charp, 0644);
> +MODULE_PARM_DESC(compliance_product, "Product name for compliance comparison");
> +
> +static char *compliance_vendor;
> +module_param(compliance_vendor, charp, 0644);
> +MODULE_PARM_DESC(compliance_vendor, "Vendor name for compliance comparison");

Also, you have provided no documentation as to why these are needed at
all, so that's not going to work :(

thanks,

greg k-h