[Intel-gfx] [PATCH 1/1] drm/i915: Fix for nested_enable_signaling BUG_ON

[Chris Wilson]

Quoting John.C.Harrison at Intel.com (2017-11-28 09:10:59)
> From: John Harrison <John.C.Harrison at Intel.com>
> 
> The call to enable signaling was occuring after the request had been
> sent to the GuC for execution on the hardware. That means that it is
> possible for the request to actually complete before the code to
> enable signaling has executed.

No, it wasn't, unless you had modified the code. Note also we switched
to a different scheme in upstream
-Chris