linux-kernel - Re: Juju

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Message-ID: <20070126064701.GA21892@kroah.com>
Date:	Thu, 25 Jan 2007 22:47:01 -0800
From:	Greg KH <greg@...ah.com>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	Kristian H??gsberg <krh@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Juju

On Thu, Jan 25, 2007 at 03:38:24PM -0800, Pete Zaitcev wrote:
> On Thu, 25 Jan 2007 16:18:35 -0500, Kristian H??gsberg <krh@...hat.com> wrote:
> 
> > > I see that ORBs are always allocated with a call (like SKB) and not
> > > embedded into drivers (like URBs). It's great, keep it up. Also,
> > > never allow drivers to pass DMA-mapped buffers into fw_send_request
> > > and friends. We made both of these mistakes in USB, and it hurts.
> > 
> > Oh, the ORBs are SBP-2 specific data structures, struct fw_transaction is 
> > probably what corresponds to USB URBs.  This struct is defined in 
> > fw-transaction.h and is available for embedding into other structs, such as 
> > struct sbp2_orb in fw-sbp2.  Is that what you're suggesting against, and what 
> > are the problems with this approach?
> 
> Fortunately we do not care about out-of-tree drivers, which are most
> affected, you may even call it a feature ^_^. My main problem is,
> we can't refcount URBs, so usbmon can't tap them and must copy.

urbs are reference counted, it's just that not all drivers who create
them use them that way :(

Perhaps you can inforce this in the new codebase...

thanks,

greg k-h
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