Re: [PATCH 2/5] netdev: bfin_mac: fix malformed UDP packet transmission when polling with KGDB

[Mike Frysinger <vapier.adi@gmail.com>]

On Fri, May 29, 2009 at 07:27, David Miller wrote:
> From: Mike Frysinger <vapier.adi@gmail.com>
>> that isnt how the DMA is being used here.  there is no register to
>> read back because the DMA controller is doing the reading indirectly.
>> but along those lines, it's not entirely clear which DMA registers
>> this SSYNC is supposed to be protecting because all of the updates are
>> happening on the descriptors in external memory, not the DMA registers
>> themselves.  i'll have Sonic clarify.
>
> Yes, that's really confusing because the commit message says
> "registers".

the SSYNC() is still correct, but the comment is wrong/misleading as
it isnt protecting the DMA registers, it's flushing the internal write
buffers
-mike