netdev - Re: [Linux-ATM-General] RX/close vcc race with solos/atmtcp/usbatm/he

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Message-ID: <1275920035.17903.4998.camel@macbook.infradead.org>
Date:	Mon, 07 Jun 2010 15:13:55 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	chas3@...rs.sourceforge.net
Cc:	linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [Linux-ATM-General] RX/close vcc race with
 solos/atmtcp/usbatm/he

On Mon, 2010-06-07 at 09:44 -0400, Chas Williams (CONTRACTOR) wrote:
> vcc's are really sockets, so you could just increase the refcount --
> sock_hold().

There are rules about where we're allowed to call sock_hold(), and I
don't think our find_vcc() functions can be made to meet them.

> however, i think the close routines dont really expect this behavior
> so the card driver's vcc close might need to be changed to wait around
> if the refcount on the vcc is > 1.

In that case I think we might as well stick with the RCU-like solution I
already implemented in the vcc close function -- which is just to wait
for the tasklet to complete, thus ensuring that it's no longer using the
defunct vcc.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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