linux-kernel - Re: [PATCH] USB: OHCI/UHCI: Add soft dependencies on ehci

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Message-ID: <2025123049-cadillac-straggler-d2fb@gregkh>
Date: Tue, 30 Dec 2025 09:15:36 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Huacai Chen <chenhuacai@...ngson.cn>
Cc: Huacai Chen <chenhuacai@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Shengwen Xiao <atzlinux@...a.com>
Subject: Re: [PATCH] USB: OHCI/UHCI: Add soft dependencies on ehci_hcd

On Tue, Dec 30, 2025 at 04:00:14PM +0800, Huacai Chen wrote:
> Commit 9beeee6584b9aa4f ("USB: EHCI: log a warning if ehci-hcd is not
> loaded first") said that ehci-hcd should be loaded before ohci-hcd and
> uhci-hcd. However, commit 05c92da0c52494ca ("usb: ohci/uhci - add soft
> dependencies on ehci_pci") only makes ohci-pci/uhci-pci depend on ehci-
> pci, which is not enough and we may still see the warnings in boot log.
> So fix it by also making ohci-hcd/uhci-hcd depend on ehci-hcd.
> 
> Cc: stable@...r.kernel.org
> Reported-by: Shengwen Xiao <atzlinux@...a.com>
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>  drivers/usb/host/ohci-hcd.c | 1 +
>  drivers/usb/host/uhci-hcd.c | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
> index 9c7f3008646e..549c965b7fbe 100644
> --- a/drivers/usb/host/ohci-hcd.c
> +++ b/drivers/usb/host/ohci-hcd.c
> @@ -1355,4 +1355,5 @@ static void __exit ohci_hcd_mod_exit(void)
>  	clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
>  }
>  module_exit(ohci_hcd_mod_exit);
> +MODULE_SOFTDEP("pre: ehci_hcd");

Ick, no, this way lies madness.  I hate the "softdep" stuff, it's
usually a sign that something is wrong elsewhere.

And don't add this _just_ to fix a warning message in a boot log, if you
don't like that message, then build the module into your kernel, right?

And I really should just go revert 05c92da0c524 ("usb: ohci/uhci - add
soft dependencies on ehci_pci") as well, that feels wrong too.

thanks,

greg k-h