On Mon, Nov 24, 2014 at 08:03:12AM +0000, Chris Wilson wrote: > 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@xxxxxxxxx> > 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@xxxxxxxxxxxxxxxxxx> > Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > Cc: Imre Deak <imre.deak@xxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx I'll pick this up queued for 3.19 (but haven't done the split yet). -Daniel > --- > drivers/gpu/drm/i915/intel_uncore.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c > index 1a3e485a4f97..f0230b0e8e11 100644 > --- a/drivers/gpu/drm/i915/intel_uncore.c > +++ b/drivers/gpu/drm/i915/intel_uncore.c > @@ -43,8 +43,8 @@ > static void > assert_device_not_suspended(struct drm_i915_private *dev_priv) > { > - WARN(HAS_RUNTIME_PM(dev_priv->dev) && dev_priv->pm.suspended, > - "Device suspended\n"); > + WARN_ONCE(HAS_RUNTIME_PM(dev_priv->dev) && dev_priv->pm.suspended, > + "Device suspended\n"); > } > > static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv) > -- > 2.1.3 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx