Re: [PATCH] udev enhancements to use kernel event queue

[Andrew Morton]

Greg KH <[e-mail]> wrote:
>
> > 3) /sbin/hotplug events can occur out of order, eg: remove event occurs, 
> > /sbin/hotplug sleeps waiting for something, insert event occurs and 
> > completes immediately.  Then the remove event completes, after the 
> > insert, resulting in out-of-order completion and a broken /dev.  I have 
> > seen this several times with udev.
> 
> I responded:
> 	Yes this happens.  I have a fix for this for udev itself.  No
> 	kernel changes are needed.  I'll show it at OLS in July if you
> 	want to see it :)

This is a significantly crappy aspect of the /sbin/hotplug callout.  I'd be
very interested in reading an outline of how you propose fixing it, without
waiting until OLS, thanks.