From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 24 Nov 2014 08:03:12 +0000 (+0000)
Subject: drm/i915: Only warn the first time we attempt to mmio whilst suspended
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~77^2~9^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2b387059817fd100cddc5a97118d63e3f3fade74;p=pandora-kernel.git

drm/i915: Only warn the first time we attempt to mmio whilst suspended

In all likelihood we will do a few hundred errnoneous register
operations if we do a single invalid register access whilst the device
is suspended. As each instance causes a WARN, this floods the system
logs and can make the system unresponsive.

The warning was first introduced in
commit b2ec142cb0101f298f8e091c7d75b1ec5b809b65
Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date:   Fri Feb 21 13:52:25 2014 -0300

    drm/i915: call assert_device_not_suspended at gen6_force_wake_work

and despite the claims the WARN is still encountered in the wild today.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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