Re: [PATCH] net: macb: fix stale data returned by MDIO reads

> A proper solution would use the IRQ as detection source rather than
> sleep-polling. See BIT 0, called MFD in driver.

Maybe.

The FEC driver used to use interrupts for its MDIO bus. But interrupts
add a lot of overhead. I swapped the FEC to polling and got a
significant speed improvement.

A lot depends on what you have actually doing with the bus. I was
using it in combination with Marvell PHYs, which can give the raw
cable test values, which is a big data set. So the speed up was
welcome. But if all the bus is used for is once per second polls for
link change, a slower bus probably does not matter.

       Andrew