Re: [RFC/PATCH] usb-storage: wait for device scanning before mountingroot

[Pekka J Enberg]

On Thu, 24 Apr 2008, Matthew Dharm wrote:
> This also has all sorts of races between do_mounts 'waiting' and the actual
> USB device enumeration.  It's entirely possible that the kernel loads via
> BIOS, the USB drivers are loaded, that forces devices to disconnect/reset,
> and they take a while to re-enumerate.  During that delay, the kernel gets
> to do_mount; now, no devices show in this "waiting for scan" count.

So how does that happen? ->storage_probe fails and driver core calls it 
later at some point?

On Thu, 24 Apr 2008, Matthew Dharm wrote:
> The right way to do this is via initrd and something like devlabel to wait
> for a specific device to appear.  On some systems, you may want to wait for
> several devices to appear.

You should be able to boot from an external USB disk without initrd. 
That's why we have the current root_delay= hack.

		Pekka
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