ath9k: fix DMA stop sequence for AR9003+

AR93xx and newer needs to stop rx before tx to avoid getting the DMA
engine or MAC into a stuck state.
This should reduce/fix the occurence of "Failed to stop Tx DMA" logspam.

b/23312248

Change-Id: I91ed0464c597c5f301bc515e0a9aeba9c353f1c1
Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
1 file changed