[PATCH][SRU/Xenial] Fix Killer 1535 wifi speed on 5G network

[AceLan Kao]

[Impact]
The TX throughput on QCA6174 Wireless card (Killer Wireless 1535)
under 5Ghz network is poor, the test result is around 10 ~ 20 Mbits/sec. 

[Fix]
The fix is suggested by Qualcomm, and it works.

[Test Case]
Without the patch, the 5GHz network speed is pretty low
   11n
      0.0-120.1 sec 271 MBytes 18.9 Mbits/sec
   11AC
      0.0-120.2 sec 141 MBytes 9.86 Mbits/sec

After applied the patch
   11n
      0.0-120.0 sec 2.04 GBytes 146 Mbits/sec
   11AC
      0.0-120.0 sec 1.17 GBytes 83.6 Mbits/sec

[MISC]
Qualcomm doesn't want to upstream this fix, and the ath10k driver architecture
changes a lot after kernel 4.4 and can't apply this fix. So, I would suggest
to have this fix as SAUCE patch only included in Ubuntu kernel.

AceLan Kao (1):
  UBUNTU: SAUCE: ath10k: fix the wifi speed issue for kill 1535

 drivers/net/wireless/ath/ath10k/mac.c | 2 ++
 1 file changed, 2 insertions(+)

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2.7.4