K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2013-05-10T10:06:45.888419Z
K 7
svn:log
V 592
Make sure the holding descriptor and link pointer are both freed during
a non-loss reset.

When the drain functions are called, the holding descriptor and link pointers
are NULLed out.

But when the processq function is called during a non-loss reset, this
doesn't occur.  So the next time a DMA occurs, it's chained to a descriptor
that no longer exists and the hardware gets angry.

Tested:

* AR5416, STA mode; use sysctl dev.ath.X.forcebstuck=1 to force a non-loss
  reset.

TODO:

* Further AR9380 testing just to check that the behaviour for the EDMA
  chips is sane.

PR:		kern/178477

END