tg3: don't clear stats while tg3_close
Now tg3 NIC's stats will be cleared after ifdown/ifup. bond_get_stats traverse its salves to get statistics,cumulative the increment.If a tg3 NIC is added to bonding as a slave,ifdown/ifup will cause bonding's stats become tremendous value (ex.1638.3 PiB) because of negative increment. Fixes: 92feeabf ("tg3: Save stats across chip resets") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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