Re: [PATCH] xen-netfront: Delete rx_refill_timer in xennet_disconnect_backend()

[Eric Dumazet]

On Mon, 2017-01-30 at 13:23 -0500, Boris Ostrovsky wrote:

> We do netif_carrier_off() first thing in xennet_disconnect_backend() and
> the only place where the timer is rearmed is xennet_alloc_rx_buffers(),
> which is guarded by netif_carrier_ok() check.

Oh well, testing netif_carrier_ok() in packet processing fast path looks
unusual and a waste of cpu cycles. I've never seen that pattern before.

If one day, we remove this netif_carrier_ok() test during a cleanup,
then the race window will open again.