Re: [patch 2.6.28-rc4] spi: pxa2xx_spi.c fix DMA mapping sequence

[Ned Forrester <nforrester-/d+BM93fTQY@public.gmane.org>]

Ned Forrester wrote:
> From: Ned Forrester <nforrester-/d+BM93fTQY@public.gmane.org>
> 
> Fixes a bug in pxa2xx_spi.c when operating in direct memory access
> (DMA) mode.  The transmit and receive buffers are allowed to be the
> same or to overlap, but pxa2xx_spi.c fails if this is attempted in DMA
> mode because it performs mapping of the rx and tx buffers in the wrong
> order. By mapping DMA_FROM_DEVICE before DMA_TO_DEVICE, it invalidates
> the cache before flushing it.  The patch corrects the order of
> mapping.  This bug exists in all versions of pxa2xx_spi.c

David,

Assuming that you accept this patch, may I attach your Ack: and forward
this to stable along with a version for kernels older than 2.6.27, or
would you prefer to forward this to stable directly and for me to also
post the the older patch to spi-devel-general for your attention?

-- 
Ned Forrester                                       nforrester-/d+BM93fTQY@public.gmane.org
Oceanographic Systems Lab                                  508-289-2226
Applied Ocean Physics and Engineering Dept.
Woods Hole Oceanographic Institution          Woods Hole, MA 02543, USA
http://www.whoi.edu/sbl/liteSite.do?litesiteid=7212
http://www.whoi.edu/hpb/Site.do?id=1532
http://www.whoi.edu/page.do?pid=10079


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