[cairo] [PATCH 3/4] dri2: Don't call the dri2 flush hook for swapbuffers unless we have a context.

[Eric Anholt]

The driver only has one reasonable place to look for its context to
flush anything, which is the current context.  Don't bother it with
having to check.
---
 src/glx/dri2_glx.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index a275ba5..2c28bc2 100644
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -535,8 +535,13 @@ dri2SwapBuffers(__GLXDRIdrawable *pdraw, int64_t target_msc, int64_t divisor,
     CARD64 ret = 0;
 
 #ifdef __DRI2_FLUSH
-    if (psc->f)
-    	(*psc->f->flush)(priv->driDrawable);
+    if (psc->f) {
+       struct glx_context *gc = __glXGetCurrentContext();
+
+       if (gc) {
+	  (*psc->f->flush)(priv->driDrawable);
+       }
+    }
 #endif
 
     /* Old servers don't send invalidate events */
-- 
1.7.4.1