net/macb: memory barriers cleanup
Remove a couple of unneeded barriers and document the remaining ones. Signed-off-by: NHavard Skinnemoen <havard@skinnemoen.net> [nicolas.ferre@atmel.com: split patch in topics] Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com> Tested-by: NJoachim Eastwood <manabian@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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