commit 69749cf99189a8a78de201ac24990c91ee111469
Author: Kristian Høgsberg <krh@redhat.com>
Date:   Wed Aug 20 11:20:13 2008 -0400

    i915: Make use of sarea_priv conditional.
    
    We fail ioctls that depend on the sarea_priv with EINVAL.
    
    Signed-off-by: Kristian Høgsberg <krh@redhat.com>
    Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 25f59c1..dbd3f49 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -55,7 +55,8 @@ int i915_wait_ring(struct drm_device * dev, int n, const char *caller)
 		if (ring->space >= n)
 			return 0;
 
-		dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
+		if (dev_priv->sarea_priv)
+			dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 
 		if (ring->head != last_head)
 			i = 0;
@@ -128,7 +129,7 @@ void i915_kernel_lost_context(struct drm_device * dev)
 	if (ring->space < 0)
 		ring->space += ring->Size;
 
-	if (ring->head == ring->tail)
+	if (ring->head == ring->tail && dev_priv->sarea_priv)
 		dev_priv->sarea_priv->perf_boxes |= I915_BOX_RING_EMPTY;
 }
 
@@ -433,10 +434,11 @@ static void i915_emit_breadcrumb(struct drm_device *dev)
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	RING_LOCALS;
 
-	dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
-
+	dev_priv->counter++;
 	if (dev_priv->counter > 0x7FFFFFFFUL)
-		dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
+		dev_priv->counter = 0;
+	if (dev_priv->sarea_priv)
+		dev_priv->sarea_priv->last_enqueue = dev_priv->counter;
 
 	BEGIN_LP_RING(4);
 	OUT_RING(MI_STORE_DWORD_INDEX);
@@ -534,6 +536,9 @@ static int i915_dispatch_flip(struct drm_device * dev)
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	RING_LOCALS;
 
+	if (!dev_priv->sarea_priv)
+		return -EINVAL;
+
 	DRM_DEBUG("%s: page=%d pfCurrentPage=%d\n",
 		  __FUNCTION__,
 		  dev_priv->current_page,
@@ -628,7 +633,8 @@ static int i915_batchbuffer(struct drm_device *dev, void *data,
 	ret = i915_dispatch_batchbuffer(dev, batch);
 	mutex_unlock(&dev->struct_mutex);
 
-	sarea_priv->last_dispatch = (int)hw_status[5];
+	if (sarea_priv)
+		sarea_priv->last_dispatch = (int)hw_status[5];
 	return ret;
 }
 
@@ -663,7 +669,8 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
 		return ret;
 	}
 
-	sarea_priv->last_dispatch = (int)hw_status[5];
+	if (sarea_priv)
+		sarea_priv->last_dispatch = (int)hw_status[5];
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index d04c526..ef03a59 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -427,7 +427,9 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 		I915_WRITE(IMR, dev_priv->irq_mask_reg);
 	(void) I915_READ(IIR); /* Flush posted writes */
 
-	dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
+	if (dev_priv->sarea_priv)
+		dev_priv->sarea_priv->last_dispatch =
+			READ_BREADCRUMB(dev_priv);
 
 	if (iir & I915_USER_INTERRUPT) {
 		dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
@@ -456,10 +458,11 @@ static int i915_emit_irq(struct drm_device * dev)
 
 	DRM_DEBUG("\n");
 
-	dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
-
+	dev_priv->counter++;
 	if (dev_priv->counter > 0x7FFFFFFFUL)
-		dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
+		dev_priv->counter = 1;
+	if (dev_priv->sarea_priv)
+		dev_priv->sarea_priv->last_enqueue = dev_priv->counter;
 
 	BEGIN_LP_RING(6);
 	OUT_RING(MI_STORE_DWORD_INDEX);
@@ -503,11 +506,15 @@ static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 		  READ_BREADCRUMB(dev_priv));
 
 	if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
-		dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
+		if (dev_priv->sarea_priv) {
+			dev_priv->sarea_priv->last_dispatch =
+				READ_BREADCRUMB(dev_priv);
+		}
 		return 0;
 	}
 
-	dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
+	if (dev_priv->sarea_priv)
+		dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 
 	i915_user_irq_get(dev);
 	DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
@@ -519,7 +526,9 @@ static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 			  READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 	}
 
-	dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
+	if (dev_priv->sarea_priv)
+		dev_priv->sarea_priv->last_dispatch =
+			READ_BREADCRUMB(dev_priv);
 
 	return ret;
 }
@@ -682,7 +691,7 @@ int i915_vblank_swap(struct drm_device *dev, void *data,
 	struct list_head *list;
 	int ret;
 
-	if (!dev_priv) {
+	if (!dev_priv || !dev_priv->sarea_priv) {
 		DRM_ERROR("%s called with no initialization\n", __func__);
 		return -EINVAL;
 	}