[Intel-gfx] [PATCH] snd/hda: Only get/put display_power once

[Chris Wilson]

Quoting Chris Wilson (2019-04-10 09:17:33)
> While we only allow a single display power reference, the current
> acquisition/release is racy and a direct call may run concurrently with
> a runtime-pm worker. Prevent the double unreference by atomically
> tracking the display_power_active cookie.

I just get the feeling this is elaborate paper and the problem is that
we shouldn't be doing a double-free in the first place.
-Chris