[FS#176] Disapearing radios for ath9k introduced between August 31 and September 4th

[LEDE Bugs]

The following task has a new comment added:

FS#176 - Disapearing radios for ath9k introduced between August 31 and September 4th
User who did this - moeller0 (moeller0)

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The tests so far pretty much indicate  commit https://github.com/lede-project/source/commit/372d0fea29e60b02154fd7176ba32e7742f6640e as having introduced the regression.

The next question is which of the 5 patches constituting that commit is the culprit?
To test this, I will test the following r1630 builds:
lede-r1630-20160919-no339-343
lede-r1630-20160919-with339_no340-343
lede-r1630-20160919-with339-340_no341-343
lede-r1630-20160919-with339-341_no342-343
lede-r1630-20160919-with339-342_no343



**Working: radios stay enabled and useable:**

lede-r1630-20160919-no339-343 (uptime 3 days)


** Testing **

lede-r1630-20160919-with339-340_no341-343 (no loss event in 51 minutes uptime, test continues)


**"Affected": radios disappear (seemingly partially triggered by moving into an area with bad reception)**

lede-r1630-20160919-with339-341_no342-343 (2 loss events of both radios in 6 minutes uptime)
lede-r1630-20160919-with339-342_no343 (2 loss events of both radios in 18 minutes uptime)
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=176#comment470