ethoc: rework mdio read/write
MDIO read and write were checking whether a timeout had expired to determine whether to recheck the result of the MDIO operation. Under heavy CPU usage, however, it was possible for the timeout to expire before the routine got around to be able to check a second time even, thus erroneousy returning an -EBUSY. This patch changes the the MDIO IO routines to try up to five times to complete the operation before giving up, thus lessening the dependency on CPU load. This resolves a problem whereby a ping flood would keep the CPU so busy that the above problem would manifest itself; the MDIO command to check link status would fail and the interface would erroneously be shut down. Signed-off-by: Jonas Bonn <jonas@southpole.se> Signed-off-by: David S. Miller <davem@davemloft.net>
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