[3.16.y-ckt stable] Patch "drm/i915: Only warn the first time we attempt to mmio whilst suspended" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Wed Jan 7 10:29:50 UTC 2015
This is a note to let you know that I have just added a patch titled
drm/i915: Only warn the first time we attempt to mmio whilst suspended
to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue
This patch is scheduled to be released in version 3.16.7-ckt4.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 4e79ced7a96868d8578cd5345f73cd2720001441 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris at chris-wilson.co.uk>
Date: Mon, 24 Nov 2014 08:03:12 +0000
Subject: drm/i915: Only warn the first time we attempt to mmio whilst
suspended
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 at 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 at chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
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 4f6fef7ac069..28ac6156ec1d 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)
--
2.1.4
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