> MDIO bus controllers are in a similar situation (with Hubert's patch)
> but at least there the frame size is fixed and I haven't heard of an
> MDIO controller to use DMA.

Linux does not have any DMA driver MDIO busses, as far as i know. It
does not make sense, since you are only transferring 16bits of
data. The vast majority are polled completion, but there is one which
generates an interrupt on completion.


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