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@odi.ch>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: stable@vger.kernel.org [3.5]
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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 03da38373552..4f2cc95ce264 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 868c7fd74854..b2c2937531a8 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 9914cf154f65..709e5ac680ec 100644
--- a/drivers/gpu/drm/nouveau/nouveau_software.h
+++ b/drivers/gpu/drm/nouveau/nouveau_software.h
@@ -23,6 +23,7 @@ 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