drm/nouveau: crash regression in 3.5

[Marcin Slusarz]

On Wed, Jul 25, 2012 at 10:46:49AM +0200, Ortwin Glück wrote:
> > Does it work if you boot without X and modprobe nouveau manually? If it does,
> > can you disable page flipping in xorg.conf (Option "PageFlip" "0" in nouveau
> > device section) and recheck with X?
> 
> It happens long before X, when the nouveau module is loaded.
> 
> > Does it work if you disable acceleration (nouveau.noaccel=1 in kernel command
> > line)?
> 
> nouveau.noaccel=1 is already on my cmdline as running X with accel 
> enabled never worked anyway.
> 
>  > Is there anything saved in /var/log/ from previous boot? Can you ssh
> > into and check dmesg? Can you use netconsole and catch full log?
> 
> Thanks for the netconsole tip. I have attached the log.
> 

Good, below patch should fix this panic.

Note that you can hit an oops in drm_handle_vblank because patch from
http://lists.freedesktop.org/archives/dri-devel/2012-May/023498.html
has not been applied (yet?).

--
From: Marcin Slusarz <marcin.slusarz at gmail.com>
Date: Wed, 25 Jul 2012 20:07:22 +0200
Subject: [PATCH] drm/nouveau: init vblank requests list

Fixes kernel panic when vblank interrupt triggers before first sync to vblank
request.

(Besides init, remove some relevant leftovers from vblank rework)

Reported-by: Ortwin Glück <odi at odi.ch>
Signed-off-by: Marcin Slusarz <marcin.slusarz at gmail.com>
Cc: stable at vger.kernel.org [3.5]
---
 drivers/gpu/drm/nouveau/nouveau_drv.h      |    2 --
 drivers/gpu/drm/nouveau/nouveau_irq.c      |    4 ----
 drivers/gpu/drm/nouveau/nouveau_software.h |    1 +
 3 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 8613cb2..b863a3a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -689,8 +689,6 @@ struct drm_nouveau_private {
 	void (*irq_handler[32])(struct drm_device *);
 	bool msi_enabled;
 
-	struct list_head vbl_waiting;
-
 	struct {
 		struct drm_global_reference mem_global_ref;
 		struct ttm_bo_global_ref bo_global_ref;
diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c b/drivers/gpu/drm/nouveau/nouveau_irq.c
index 868c7fd..b2c2937 100644
--- a/drivers/gpu/drm/nouveau/nouveau_irq.c
+++ b/drivers/gpu/drm/nouveau/nouveau_irq.c
@@ -41,12 +41,8 @@
 void
 nouveau_irq_preinstall(struct drm_device *dev)
 {
-	struct drm_nouveau_private *dev_priv = dev->dev_private;
-
 	/* Master disable */
 	nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
-
-	INIT_LIST_HEAD(&dev_priv->vbl_waiting);
 }
 
 int
diff --git a/drivers/gpu/drm/nouveau/nouveau_software.h b/drivers/gpu/drm/nouveau/nouveau_software.h
index e60bc6c..b507a92 100644
--- a/drivers/gpu/drm/nouveau/nouveau_software.h
+++ b/drivers/gpu/drm/nouveau/nouveau_software.h
@@ -38,6 +38,7 @@ static inline void
 nouveau_software_context_new(struct nouveau_software_chan *pch)
 {
 	INIT_LIST_HEAD(&pch->flip);
+	INIT_LIST_HEAD(&pch->vblank.list);
 }
 
 static inline void
--