The patch below does not apply to the 3.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 9cba5efab5a8145ae6c52ea273553f069c294482 Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Date: Tue, 29 Jul 2014 02:36:44 +0200
Subject: [PATCH] drm/nouveau: Dis/Enable vblank irqs during suspend/resume.
Vblank irqs don't get disabled during suspend or driver
unload, which causes irq delivery after "suspend" or
driver unload, at least until the gpu is powered off.
This could race with drm_vblank_cleanup() in the case
of nouveau and cause a use-after-free bug if the driver
is unloaded.
More annoyingly during everyday use, at least on nv50
display engine (likely also others), vblank irqs are
off after a resume from suspend, but the drm doesn't
know this, so all vblank related functionality is dead
after a resume. E.g., all windowed OpenGL clients will
hang at swapbuffers time, as well as many fullscreen
clients in many cases. This makes suspend/resume useless
if one wants to use any OpenGL apps after the resume.
In Linux 3.16, drm_vblank_on() was added, complementing
the older drm_vblank_off() to solve these problems
elegantly, so use those calls in nouveaus suspend/resume
code.
For kernels 3.8 - 3.15, we need to cherry-pick the
drm_vblank_on() patch to support this patch.
Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> #v3.16
Cc: <stable@xxxxxxxxxxxxxxx> #v3.8+: f275228: drm: Add drm_vblank_on()
Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 47ad74255bf1..dd469dbeaae1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -404,6 +404,11 @@ nouveau_display_fini(struct drm_device *dev)
{
struct nouveau_display *disp = nouveau_display(dev);
struct drm_connector *connector;
+ int head;
+
+ /* Make sure that drm and hw vblank irqs get properly disabled. */
+ for (head = 0; head < dev->mode_config.num_crtc; head++)
+ drm_vblank_off(dev, head);
/* disable hotplug interrupts */
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
@@ -620,6 +625,8 @@ void
nouveau_display_resume(struct drm_device *dev)
{
struct drm_crtc *crtc;
+ int head;
+
nouveau_display_init(dev);
/* Force CLUT to get re-loaded during modeset */
@@ -629,6 +636,10 @@ nouveau_display_resume(struct drm_device *dev)
nv_crtc->lut.depth = 0;
}
+ /* Make sure that drm and hw vblank irqs get resumed if needed. */
+ for (head = 0; head < dev->mode_config.num_crtc; head++)
+ drm_vblank_on(dev, head);
+
drm_helper_resume_force_mode(dev);
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
--
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