Re: [linux-usb-devel] usb-storage bug in 2.6.12-rc3

[Oliver Neukum <oliver@neukum.org>]

Am Freitag, 29. April 2005 21:28 schrieb David Brownell:
> On Friday 29 April 2005 11:23 am, Roman Kagan wrote:
> > 
> > ... instead of trying to make sure the attributes are available via
> > sysfs at hotplug time, we can use another means to pass them to hotplug:
> > we can add a routine, which, when called from the .hotplug function
> > and given pointers to struct attribute and struct device, would add
> > environment variable
> > 
> > SYSFS_attrName=attrValue
> 
> Color me amused.  That was the original way to pass information
> to hotplug agents ... back then (2.4.0.test10 or so), there was
> usually no other way to export the relevant data.

Does that mean it was a bad idea? At least it makes sure that
there are less race conditions.

> I'd rather just guarantee that the sysfs device were fully
> constructed (attributes and all) before the driver binding and
> hotplug stages of enumeration started.  That's been a problem
> all along, and that's what those recent changes were supposed
> to be addressing.

Even if you can make sure they had been set up before the script
started, how do you make sure they are still around?

	Regards
		Oliver


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