net: fec: fix regression on i.MX28 introduced by rx_copybreak support

[Lothar Waßmann]

Hi,

David Miller wrote:
> From: Lothar Waßmann <LW at KARO-electronics.de>
> Date: Thu, 30 Oct 2014 07:51:04 +0100
> 
> >> Also, I don't thnk your DIV_ROUND_UP() eliminate for the loop
> >> in swap_buffer() is valid.  The whole point is that the current
> >> code handles buffers which have a length which is not a multiple
> >> of 4 properly, after your change it will no longer do so.
> >>
> > Do you really think so?
> 
> Yes, because you're rounding down so you'll miss the final
> partial word (if any).
>
Nope. DIV_ROUND_UP() would give '1' as upper bound for lengths from 1 to
4, '2' for lengths from 5 to 8 and so on.

The loop with increment 4 and i < len does exactly the same.
Try it for yourself, if you don't believe it.


Lothar Waßmann
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