[TG3]: Use mmiowb in tg3_poll
From: <akepner@sgi.com> Returning from tg3_poll() without flushing the PIO write which reenables interrupts can result in lower cpu utilization and higher throughput. So use a memory barrier, mmiowb(), instead of flushing the write with a PIO read. Signed-off-by: Arthur Kepner <akepner@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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