xen-netback: notify immediately after pushing Tx response.
This fixes a performance regression introduced by 7fbb9d84 (xen-netback: release pending index before pushing Tx responses) Moving the notify outside of the spin locks means it can be delayed a long time (if the dealloc thread is descheduled or there is an interrupt or softirq). Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com> Reviewed-by: NZoltan Kiss <zoltan.kiss@linaro.org> Acked-by: NWei Liu <wei.liu2@citrix.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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