Messages in this thread | | | Date | Wed, 08 Jul 2009 11:05:38 -0400 | From | Peter Jones <> | Subject | Re: can we move USB_DEVICEFS to non-embedded? |
| |
Greg KH wrote: > On Wed, Jul 08, 2009 at 10:12:08AM -0400, Peter Jones wrote: >> Greg KH wrote: >>> On Wed, Jul 08, 2009 at 09:55:04AM -0400, Peter Jones wrote: >>>> On 07/08/2009 09:52 AM, Peter Jones wrote: >>>>> On 07/08/2009 06:54 AM, Dave Airlie wrote: >>>>> >>>>>> I'm not quite sure if something in the F11 initrd needs usbfs for >>>>>> something (cc'ed Peter) >>>>> Not a thing. >>>> Actually, I take it back. We do mount usbfs, and we examine >>>> /proc/bus/usb/devices as a heuristic to try and determine if >>>> all the devices have been enumerated. >>> How can you ever know if all devices are enumerated as you don't know >>> how many devices will be showing up? >> You don't, that's why I said it's a heuristic. But basically, we have a >> timeout, and if the device list doesn't change in that amount of time, we >> call it done. >> >> It's not the best technique ever, but it does work. > > Works for what? Why would you want to delay your boot process like > this?
Because otherwise when we actually get to mounting the root filesystem, the device *isn't yet present*.
>>>> So that could be related to what you're seeing. >>> That file is now available in /sys/kernel/debug/usb/devices if you >>> really need it. >> Oh, okay. I can change it to use that then. >> >>> But I would think that you do not. >> Well, we pretty much do until we switch to dracut. > > What is dracut and why would it change this?
It's the replacement for mkinitrd, and it's using hotplug events for this stuff instead.
> As no other distro does this kind of waiting, I'm a bit confused as to > the need for it.
Good to know you pay attention to what's going on in the Linux world.
-- Peter
| |