K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2011-10-18T07:13:07.691952Z
K 7
svn:log
V 201
Break out the ath_draintxq() code into two halves - the half that
drains the queue, and another half which stops the TX DMA.

Call the new function ath_stoptxdma(). It requires the sc lock
to be held.

END