netdev - Re: [PATCH net v2] xen-netback: clear vif->task on disconnect

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Date:	Tue, 03 Dec 2013 11:50:03 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	paul.durrant@...rix.com
Cc:	xen-devel@...ts.xen.org, netdev@...r.kernel.org,
	wei.liu2@...rix.com, ian.campbell@...rix.com,
	david.vrabel@...rix.com
Subject: Re: [PATCH net v2] xen-netback: clear vif->task on disconnect

From: Paul Durrant <paul.durrant@...rix.com>
Date: Tue, 3 Dec 2013 14:06:25 +0000

> xenvif_start_xmit() relies on checking vif->task for NULL to determine
> whether the vif is ready to accept packets. The task thread is stopped in
> xenvif_disconnect() but task is not set to NULL. Thus, on a re-connect the
> check will give a false positive.
> 
> Also since commit ea732dff5cfa10789007bf4a5b935388a0bb2a8f (Handle backend
> state transitions in a more robust way) it should not be possible for
> xenvif_connect() to be called if the vif is already connected so change the
> check of vif->tx_irq to a BUG_ON() and also add a BUG_ON(vif->task).
> 
> Signed-off-by: Paul Durrant <paul.durrant@...rix.com>

Applied, thanks.
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