tree e5d336ee7b7eac1b2e0091e948085de284ae344c
parent 1319ebadf185933e6b7ff95211d3cef9004e9754
author Lennert Buytenhek <buytenh@wantstofly.org> 1241006298 +0000
committer David S. Miller <davem@davemloft.net> 1241051059 -0700

mv643xx_eth: 64bit mib counter read fix

On several mv643xx_eth hardware versions, the two 64bit mib counters
for 'good octets received' and 'good octets sent' are actually 32bit
counters, and reading from the upper half of the register has the same
effect as reading from the lower half of the register: an atomic
read-and-clear of the entire 32bit counter value.  This can under heavy
traffic occasionally lead to small numbers being added to the upper
half of the 64bit mib counter even though no 32bit wrap has occured.

Since we poll the mib counters at least every 30 seconds anyway, we
might as well just skip the reads of the upper halves of the hardware
counters without breaking the stats, which this patch does.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Cc: stable@kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>