Re: general hotplug/udev questions

[Greg KH <greg@kroah.com>]

On Fri, Aug 19, 2005 at 03:09:59PM +0600, Alexander E. Patrakov wrote:
> Kay Sievers wrote:
> 
> >SUSE's current "event replay from initramfs" works nice so far and is
> >a generic way to solve the boot sequencing problems. One other option
> >may be to crawl /sys and submit the events to udevd instead of getting
> >it from initramfs. That would also work with every kernel, not only
> >with a special prepared initramfs. We will need to test if this
> >option works "good enough" - for now it only sounds like a nice
> >alternative.
> > 
> >
> Do I understand correctly that the "crawl through sysfs" approach means 
> bus-specific conversion between sysfs contents (e.g the fact that 
> /sys/bus/usb/devices/1-1/idProduct contains "4002" here) and environment 
> variables (in this case, PRODUCT=...)?

Yes, but it's a world easier now that we have added the 'modalias' sysfs
files so we don't have to reconstruct anything.  All we care about at
coldplug time is loading the modules and creating existing device nodes.

The hotplug events can usually be safely ignored.

Although some people don't feel the same way, so they "plug" the hotplug
events and then replay them, which is probably the more correct thing to
do.

> I.e., is it just a reimplementation of old /etc/hotplug/*.rc scripts
> in C?

no.

thanks,

greg k-h


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