Adrian Chadd 1006fc0c3b Modify ath_descdma_setup() to take a descriptor size parameter.
The AR9300 and later descriptors are 128 bytes, however I'd like to make
sure that isn't used for earlier chips.

* Populate the TX descriptor length field in the softc with
  sizeof(ath_desc)

* Use this field when allocating the TX descriptors

* Pre-AR93xx TX/RX descriptors will use the ath_desc size; newer ones will
  query the HAL for these sizes.
2012-07-23 23:40:13 +00:00
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