linux-kernel - Re: [PATCH 2/2] uevent: handle duplicate uevent

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Message-ID: <20080828173301.GB18097@kroah.com>
Date:	Thu, 28 Aug 2008 10:33:01 -0700
From:	Greg KH <greg@...ah.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] uevent: handle duplicate uevent_var keys properly

On Thu, Aug 28, 2008 at 07:00:39PM +0200, Tejun Heo wrote:
> Greg KH wrote:
> > On Thu, Aug 28, 2008 at 06:31:02PM +0200, Tejun Heo wrote:
> >> add_uevent_var() appends the specified variable whether the new entry
> >> has duplicate key or not.  This patch makes add_uevent_var() to
> >> override the existing entry if an entry with the same key is added
> >> later.  This will be used by CUSE (character device in userland) to
> >> fake hotplug events.
> > 
> > Hm, do you have any pointers to CUSE, that sounds interesting.
> 
> I'm in the process of sending patches.  I'll cc you on the actual postings.

Thanks, I'd appreciate that.

> > And how would this change interact with fake hotplug events?
> 
> CUSE creates actual devices but those devices are all cuse class
> devices.  To play nicely with sysfs/hal, the ADD/REMOVE uevents should
> have about the same variables as the actual device including the
> SUBSYSTEM, so that's where the overriding comes in.  CUSE client tells
> CUSE that it needs to set such such envs for uevents and CUSE overrides
> uevents before sending it out so that sysfs/hal can be fooled.

Heh, nice, sounds interesting.  I'll queue this patch up.

thanks,

greg k-h
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