Re: [linux-usb-devel] Re: Linux 2.6.16-rc3

[Alan Stern <stern@rowland.harvard.edu>]

On Wed, 15 Feb 2006, Greg KH wrote:

> On Wed, Feb 15, 2006 at 04:52:43PM -0500, Alan Stern wrote:
> > On Wed, 15 Feb 2006, Greg KH wrote:
> > 
> > > On Wed, Feb 15, 2006 at 05:35:08PM +0100, Arjan van de Ven wrote:
> > > > On Wed, 2006-02-15 at 08:27 -0800, Greg KH wrote:
> > > > > 
> > > > > Nah, I don't think it's a good idea.  James's patch should work just
> > > > > fine.
> > > > 
> > > > another option is to have a "kill list" which you put the thing on, and
> > > > then wake up a thread. only 2 pointers in the object ;(
> > > 
> > > Hm, that's almost what James's patch is trying to do.  Care to mock up a
> > > patch that shows this?  It might be a simpler solution.
> > 
> > It won't work.  You might have to do 2 put_device calls on the same 
> > structure.  That's why I suggested the "pending puts" counter; something 
> > can't go on a list more than once.
> 
> It would only go on the list if the "put" was the last one.  Otherwise
> it would not make any sense to put it on any list.

There's no way to know whether or not any particular "put" is the last 
one.  So you have to assume they all are.

Alan Stern

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