sky2: status ring race fix
The D-Link PCI-X board (and maybe others) can lie about status ring entries. It seems it will update the register for last status index before completing the DMA for the ring entry. To avoid reading stale data, zap the old entry and check. Signed-off-by: NStephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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