From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed, 30 Jan 2013 14:59:57 +0000 (+0100)
Subject: drm/i915: kill cargo-culted locking from power well code
X-Git-Tag: v3.9-rc1~83^2~36^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6b25a88752e8e9dc33c700712059b094d3da3219;p=pandora-kernel.git

drm/i915: kill cargo-culted locking from power well code

We may not concurrently change the power wells code. Which
is already guaranteed since modesets aren't concurrent. That
leaves races against setup/teardown/suspend/resume, and for
those we already (try) rather hard not to hit concurrent
modesets.

No debug WARN_ON added since that would require us to grab the
modeset locks in init/suspend code. Which is again just cargo
culting since just grabbing the locks in those paths isn't good
enough, we need the right order of operations, too.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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