blk: INFO: possible irq lock inversion dependency detected

From: Indrek Ardel
Date: Thu Dec 25 2014 - 13:59:46 EST

Zyxel NSA-220 (orion5x) reports such message during poweroff/reboot
(repro: boot, log in, poweroff). Detailed output can be found at

Bisect showed that this started appearing since
4830959318d14bd8856437ad5beea6016ef8c484 was applied.

Kernel configs:

That's all I have thus far.

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