drm/i915: Only warn the first time we attempt to mmio whilst suspended
authorChris Wilson <chris@chris-wilson.co.uk>
Mon, 24 Nov 2014 08:03:12 +0000 (08:03 +0000)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Wed, 3 Dec 2014 08:29:35 +0000 (09:29 +0100)
commit2b387059817fd100cddc5a97118d63e3f3fade74
treea96d3700f77c2b939a13451a58ab961db11b7c8e
parentb4eb1564623b2ee82e3296c808c68c6fe47548cd
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>
drivers/gpu/drm/i915/intel_uncore.c