linux-kernel - Re: OHCI root_port_reset() deadly loop...

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Message-Id: <20071009050019.C6C6023718A@adsl-69-226-248-13.dsl.pltn13.pacbell.net>
Date:	Mon, 08 Oct 2007 22:00:19 -0700
From:	David Brownell <david-b@...bell.net>
To:	greg@...ah.com, davem@...emloft.net
Cc:	linux-usb-users@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: OHCI root_port_reset() deadly loop...

> > > The old /etc/hotplug/usb.rc script made sure to load those modules
> > > in the correct order:  EHCI first.
> > 
> > I expected to find something cute attempting to handle this under
> > /etc/udev, I have failed so far :-)
>
> No, nothing cute in udev itself, but it seems that all distros that I
> know of have a "load these modules now" type setting in their init
> scripts that can be used here.
>
> I can't think of a way to enforce this load order on the modules
> themselves due to the fact that OHCI might not even be needed for EHCI
> devices on UHCI (Intel) based chipsets :(

Assuming PCI is present, /sys/bus/pci/devices/*/class can tell
if EHCI is present (0x0c0320) ... if so, load that driver.
Then repeat for OHCI (0x0c0310) and UHCI (0x0c0300).
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