This is a note to let you know that I've just added the patch titled drm/i915: Only warn the first time we attempt to mmio whilst suspended to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-i915-only-warn-the-first-time-we-attempt-to-mmio-whilst-suspended.patch and it can be found in the queue-3.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 2b387059817fd100cddc5a97118d63e3f3fade74 Mon Sep 17 00:00:00 2001 From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Date: Mon, 24 Nov 2014 08:03:12 +0000 Subject: drm/i915: Only warn the first time we attempt to mmio whilst suspended From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> commit 2b387059817fd100cddc5a97118d63e3f3fade74 upstream. 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> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_uncore.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- 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) Patches currently in stable-queue which might be from chris@xxxxxxxxxxxxxxxxxx are queue-3.18/drm-i915-only-warn-the-first-time-we-attempt-to-mmio-whilst-suspended.patch queue-3.18/drm-i915-disallow-pin-ioctl-completely-for-kms-drivers.patch queue-3.18/drm-i915-don-t-complain-about-stolen-conflicts-on-gen3.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html