usb: musb: regression since 4.9 on omap4-panda-es (caused by d8e5f0eca1e8)

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Tony,

since 4.9 (4.8 was fine) I can not boot omap4-panda-es if the musb is compiled in. The kernel will stuck printing:

** 206 printk messages dropped ** [ 8.926727] musb_bus_suspend 2584: trying to suspend as a_idle while active

The bisect (log is [1]) points to:
d8e5f0eca1e8 usb: musb: Fix hardirq-safe hardirq-unsafe lock order error

and reverting the d8e5f0eca1e8 makes the board to boot up fine (Linux 4.11-rc5 and next-20170331).

any idea on how to fix this w/o reverting the commit?

[1] https://pastebin.com/Z2HJY229

- Péter
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