Took the latest snapshot from https://www.kernel.org/pub/linux/kernel/projects/backports/ + ran make defconfig-ath9k && make && sudo make install. Hopefully the patches will get in soon enough, so that I don't need to rerun the module building every time kernel updates.
[src: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/971809/comments/63]
