K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2013-04-02T06:24:22.648692Z
K 7
svn:log
V 695
Some TX dmamap cleanups.

* Don't use BUS_DMA_ALLOCNOW for descriptor DMA maps; we never use
  bounce buffers for the descriptors themselves.

* Add some XXX's to mark where the ath_buf has its mbuf ripped from
  underneath it without actually cleaning up the dmamap.  I haven't
  audited those particular code paths to see if the DMA map is guaranteed
  to be setup there; I'll do that later.

* Print out a warning if the descdma tidyup code is given some descriptors
  w/ maps to free.  Ideally the owner will free the mbufs and unmap
  the descriptors before freeing the descriptor/ath_buf pairs, but
  right now that's not guaranteed to be done.

Reviewed by:	scottl (BUS_DMA_ALLOCNOW tag)

END