Adrian Chadd de2d9111ec Be slightly more paranoid with the TX DMA buffer maximum threshold.
Specifically - never jack the TX FIFO threshold up to the absolute
maximum; always leave enough space for two DMA transactions to
appear.

This is a paranoia from the Linux ath9k driver.  It can't hurt.

Obtained from:	Linux ath9k
2013-02-21 08:42:40 +00:00
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