1 files changed, 18 insertions, 18 deletions

diff --git a/drivers/char/drm/i915_irq.c b/drivers/char/drm/i915_irq.c
index 1a5edec7e190..e5463b111fc0 100644
--- a/drivers/char/drm/i915_irq.c
+++ b/drivers/char/drm/i915_irq.c
@@ -153,20 +153,26 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
                 DRM_WAKEUP(&dev_priv->irq_queue);
 
         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
-                if ((dev_priv->vblank_pipe &
+                int vblank_pipe = dev_priv->vblank_pipe;
+
+                if ((vblank_pipe &
                      (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
                     == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
                         if (temp & VSYNC_PIPEA_FLAG)
                                 atomic_inc(&dev->vbl_received);
                         if (temp & VSYNC_PIPEB_FLAG)
                                 atomic_inc(&dev->vbl_received2);
-                } else
+                } else if (((temp & VSYNC_PIPEA_FLAG) &&
+                            (vblank_pipe & DRM_I915_VBLANK_PIPE_A)) ||
+                           ((temp & VSYNC_PIPEB_FLAG) &&
+                            (vblank_pipe & DRM_I915_VBLANK_PIPE_B)))
                         atomic_inc(&dev->vbl_received);
 
                 DRM_WAKEUP(&dev->vbl_queue);
                 drm_vbl_send_signals(dev);
 
-                drm_locked_tasklet(dev, i915_vblank_tasklet);
+                if (dev_priv->swaps_pending > 0)
+                        drm_locked_tasklet(dev, i915_vblank_tasklet);
         }
 
         return IRQ_HANDLED;
@@ -397,7 +403,7 @@ int i915_vblank_swap(DRM_IOCTL_ARGS)
                                  sizeof(swap));
 
         if (swap.seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
-                             _DRM_VBLANK_SECONDARY)) {
+                             _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS)) {
                 DRM_ERROR("Invalid sequence type 0x%x\n", swap.seqtype);
                 return DRM_ERR(EINVAL);
         }
@@ -406,11 +412,6 @@ int i915_vblank_swap(DRM_IOCTL_ARGS)
 
         seqtype = swap.seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
 
-        if (seqtype == _DRM_VBLANK_RELATIVE && swap.sequence == 0) {
-                DRM_DEBUG("Not scheduling swap for current sequence\n");
-                return DRM_ERR(EINVAL);
-        }
-
         if (!(dev_priv->vblank_pipe & (1 << pipe))) {
                 DRM_ERROR("Invalid pipe %d\n", pipe);
                 return DRM_ERR(EINVAL);
@@ -428,21 +429,20 @@ int i915_vblank_swap(DRM_IOCTL_ARGS)
 
         curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received);
 
-        spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
-
-        switch (seqtype) {
-        case _DRM_VBLANK_RELATIVE:
+        if (seqtype == _DRM_VBLANK_RELATIVE)
                 swap.sequence += curseq;
-                break;
-        case _DRM_VBLANK_ABSOLUTE:
-                if ((curseq - swap.sequence) <= (1<<23)) {
-                        spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
+
+        if ((curseq - swap.sequence) <= (1<<23)) {
+                if (swap.seqtype & _DRM_VBLANK_NEXTONMISS) {
+                        swap.sequence = curseq + 1;
+                } else {
                         DRM_DEBUG("Missed target sequence\n");
                         return DRM_ERR(EINVAL);
                 }
-                break;
         }
 
+        spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
+
         list_for_each(list, &dev_priv->vbl_swaps.head) {
                 vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);