Comment # 15 on bug 1186194 from Takashi Iwai

Now I'm back from vacation.

My patched kernel mentioned in comment 11 is really a hack, just dropping
napi_disable() / napi_enable() calls at runtime and system suspends
temporarily.
The fact that this patch worked implies that the usages of napi_disable() calls
there are doubtful and very likely buggy.  But fixing this properly needs more
deep consideration.

That said, there are multiple bugs here:
- The recursive runtime PM handling that causes a deadlock; this one is
addressed by the patch in comment 8
- The napi_disable() / napi_enable() calls at the runtime / system resume
callbacks that again causes the deadlock