Re: Delayed hotplug events

[Hannes Reinecke <hare@suse.de>]

Oliver Neukum wrote:
> Am Freitag, 18. Juni 2004 01:57 schrieb Greg KH:
> 
>>>On Thu, Jun 17, 2004 at 03:22:07PM -0500, linas@austin.ibm.com wrote:
>>>
>>>>By contrast, I can't see what's architecturally unclean about 
>>>>having device drivers make the call as to when they think they
>>>>are finally up and ready to go, e.g. by making one puny subroutine 
>>>>call at the end of thier init sequence.  Why would this be a bad idea?
>>>
>>>Because it would be a major architecture change in the middle of a
>>>stable kernel series.  I'm not going to agree to do that at this time.
> 
> 
> If you are willing to use a model of a blocking counter you can confine
> the changes to just the actual hotplug generation. The change is well
> encapsuled. Drivers not caring about the block/unblock affair simply get
> the old behavior.
> It's less elegant than waiting for the specific files, but workable.
> 
You mean add an additional sysfs attribute which serves as an checkpoint 
(i.e. if this attribute exists, the initialisation is done)?
Neat. Fixing the drivers (or even adding another generic function to 
drivers/base/core.c) should be pretty straightforward.
One could even add another ENV which contains the name of the checkpoint 
attribute; this way it's pretty clear to any script whether it needs to 
wait or not.
This would also solve the timeout problem, as we could teach udevd to 
wait for this checkpoint attribute to appear; if a matching 'remove' 
event is received before the checkpoint is visible, udevd could just 
drop both events.
Greg: acceptable?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke			hare@suse.de
SuSE Linux AG				S390 & zSeries
Maxfeldstraße 5				+49 911 74053 688
90409 Nürnberg				http://www.suse.de


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