K 10
svn:author
V 10
nwhitehorn
K 8
svn:date
V 27
2013-09-16T14:32:56.579455Z
K 7
svn:log
V 310
Fix bug in busdma: if segs is a preexisting buffer, we memcpy it
into the DMA map. The length of the buffer had not yet been
initialized, however, so this would copy gibberish unless it
happened to be right by chance. This bug mostly only affected
systems with IOMMUs.

Approved by:	re (gjb)
MFC after:	3 days

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