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

[David Miller <davem@xxxxxxxxxxxxx>]

From: Paul Durrant <paul.durrant@xxxxxxxxxx>
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@xxxxxxxxxx>

Applied, thanks.

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