1 files changed, 27 insertions, 10 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index b8e509ae065..062f353497e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -274,24 +274,35 @@ int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
         return ret;
 }
 
-int i915_get_vblank_timestamp(struct drm_device *dev, int crtc,
+int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
                               int *max_error,
                               struct timeval *vblank_time,
                               unsigned flags)
 {
-        struct drm_crtc *drmcrtc;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct drm_crtc *crtc;
 
-        if (crtc < 0 || crtc >= dev->num_crtcs) {
-                DRM_ERROR("Invalid crtc %d\n", crtc);
+        if (pipe < 0 || pipe >= dev_priv->num_pipe) {
+                DRM_ERROR("Invalid crtc %d\n", pipe);
                 return -EINVAL;
         }
 
         /* Get drm_crtc to timestamp: */
-        drmcrtc = intel_get_crtc_for_pipe(dev, crtc);
+        crtc = intel_get_crtc_for_pipe(dev, pipe);
+        if (crtc == NULL) {
+                DRM_ERROR("Invalid crtc %d\n", pipe);
+                return -EINVAL;
+        }
+
+        if (!crtc->enabled) {
+                DRM_DEBUG_KMS("crtc %d is disabled\n", pipe);
+                return -EBUSY;
+        }
 
         /* Helper routine in DRM core does all the work: */
-        return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
-                                                     vblank_time, flags, drmcrtc);
+        return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
+                                                     vblank_time, flags,
+                                                     crtc);
 }
 
 /*
@@ -348,8 +359,12 @@ static void notify_ring(struct drm_device *dev,
                         struct intel_ring_buffer *ring)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
-        u32 seqno = ring->get_seqno(ring);
+        u32 seqno;
 
+        if (ring->obj == NULL)
+                return;
+
+        seqno = ring->get_seqno(ring);
         trace_i915_gem_request_complete(dev, seqno);
 
         ring->irq_seqno = seqno;
@@ -831,6 +846,8 @@ static void i915_capture_error_state(struct drm_device *dev)
                 i++;
         error->pinned_bo_count = i - error->active_bo_count;
 
+        error->active_bo = NULL;
+        error->pinned_bo = NULL;
         if (i) {
                 error->active_bo = kmalloc(sizeof(*error->active_bo)*i,
                                            GFP_ATOMIC);
@@ -1278,12 +1295,12 @@ static int i915_wait_irq(struct drm_device * dev, int irq_nr)
         if (master_priv->sarea_priv)
                 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 
-        ret = -ENODEV;
         if (ring->irq_get(ring)) {
                 DRM_WAIT_ON(ret, ring->irq_queue, 3 * DRM_HZ,
                             READ_BREADCRUMB(dev_priv) >= irq_nr);
                 ring->irq_put(ring);
-        }
+        } else if (wait_for(READ_BREADCRUMB(dev_priv) >= irq_nr, 3000))
+                ret = -EBUSY;
 
         if (ret == -EBUSY) {
                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",