netdev - Re: [PATCH] solos-pci: Fix race condition in tasklet RX handling

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Date:	Sat, 07 Aug 2010 23:02:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dwmw2@...radead.org
Cc:	netdev@...r.kernel.org, nathan@...verse.com.au,
	linux-atm-general@...ts.sourceforge.net
Subject: Re: [PATCH] solos-pci: Fix race condition in tasklet RX handling

From: David Woodhouse <dwmw2@...radead.org>
Date: Fri, 06 Aug 2010 17:17:36 +0100

> We were seeing faults in the solos-pci receive tasklet when packets
> arrived for a VCC which was currently being closed:
 ...
> This patch uses an RCU-inspired approach to fix it. In the RX tasklet's
> find_vcc() function we first refuse to use a VCC which already has the
> ATM_VF_READY bit cleared. And in the VCC close function, we synchronise
> with the tasklet to ensure that it can't still be using the VCC before
> we continue and allow the VCC to be destroyed.
> 
> Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
> Tested-by: Nathan Williams <nathan@...verse.com.au>
> Cc: stable@...nel.org

Applied, thanks David.
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