Re: rootfs on USB storage device

[Pete Zaitcev <zaitcev@redhat.com>]

> > > Does anybody have a clue as to what the USB bus has to do with
> > > /dev/console?
> >
> > It's a timing issue, and has nothing to do with /dev/console.  If you
> > sit and spin before you try to mount the root fs, the USB subsystem will
> > have enough time to find the drive.  There's a few patches that do this
> > in the lkml archives.
> >
> > greg k-h
> 
> It does not seem so. I included several seconds of mdelay() (and lots of
> printk()'s) while I was debugging, and that didnt change a thing. I added
> a.o. 4 seconds of mdelay() right before the open(), and 2 seconds right
> after the open() and the two dup()'s. The storage device was detected at
> the beginning of that last delay. [...]

I think khubd needs to run to complete whole process and mdelay()
locks it out. You need something that calls schedule() for USB
detection to work. Try to use schedule_timeout() instead of mdelay().

-- Pete