Mesa (master): llvmpipe: Fix fence wait.

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: 680071502ffe54c96ef9f458a9e1c668bb27fe76
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=680071502ffe54c96ef9f458a9e1c668bb27fe76

Author: José Fonseca <jfonseca at vmware.com>
Date:   Thu May  6 21:33:01 2010 +0100

llvmpipe: Fix fence wait.

Avoids crashing when fence is NULL (LP_NUM_THREADS=0) and leaking when
it is not.

---

 src/gallium/drivers/llvmpipe/lp_query.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/gallium/drivers/llvmpipe/lp_query.c b/src/gallium/drivers/llvmpipe/lp_query.c
index a1836bb..c23e983 100644
--- a/src/gallium/drivers/llvmpipe/lp_query.c
+++ b/src/gallium/drivers/llvmpipe/lp_query.c
@@ -106,7 +106,10 @@ llvmpipe_begin_query(struct pipe_context *pipe, struct pipe_query *q)
    if (pq->binned) {
       struct pipe_fence_handle *fence;
       pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, &fence);
-      pipe->screen->fence_finish(pipe->screen, fence, 0);
+      if (fence) {
+         pipe->screen->fence_finish(pipe->screen, fence, 0);
+         pipe->screen->fence_reference(pipe->screen, &fence, NULL);
+      }
    }
 
    lp_setup_begin_query(llvmpipe->setup, pq);