[FS#471] BT Home Hub 5 xrx200 SMP "rcu_sched self-detected stall on CPU" panic and freeze

[LEDE Bugs]

The following task has a new comment added:

FS#471 - BT Home Hub 5 xrx200 SMP "rcu_sched self-detected stall on CPU" panic and freeze
User who did this - Mauro Mozzarelli (ezplanet)

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This task appears to be related to Task #473

Disabling ATF as suggested in task #473 as follows:

echo 0 > /sys/kernel/debug/ieee80211/phy1/ath9k/airtime_flags

appears to resolve BT Home Hub 5 crashing (no more crashes)
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=471#comment1677