Re: usb race possible?

[Greg KH <greg@kroah.com>]

On Wed, Jun 15, 2005 at 04:32:00PM +0200, Andreas Jellinghaus wrote:
> On Wednesday 15 June 2005 16:28, Greg KH wrote:
> > On Wed, Jun 15, 2005 at 03:33:40PM +0200, Andreas Jellinghaus wrote:
> > > On Tuesday 14 June 2005 16:22, Kay Sievers wrote:
> > > > That is ok, you need to wait in userspace for the files to show up.
> > > > It's not easy to fix in the kernel. Maybe we will get there some day...
> > >
> > > do you think "sleep 1" is good enough?
> >
> > Try it and find out :)
> >
> > > or do I need to implement a full scale
> > > open&retry solution?
> >
> > If you want it to always work on all machines, yes.
> 
> ok thanks.
> 
> <evil question>
> but wouldn't it be better if the hotplug system did that,
> instead of putting the same code into every application?

We used to have code that did that, look at the old udev releases.
"wait_for_sysfs" was what it was called.  Turned out that just putting
that logic into udev was easier :)

So, just put yourself into /etc/dev.d/ or in a udev rule and you should
be fine and not have to do the hotplug wait logic.

hope this helps,

greg k-h


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