This patch has been:

Reviewed-by: Robert Foss <robert.f...@collabora.com>

On 2018-11-27 20:50, Gert Wollny wrote:
From: Gert Wollny <gert.wol...@collabora.com>

vtest doesn't implement the according API and would segfault:

Program received signal SIGSEGV, Segmentation fault.
   #0  0x0000000000000000 in ?? ()
   #1  in virgl_fence_server_sync  at
        src/gallium/drivers/virgl/virgl_context.c:1049
   #2  in st_server_wait_sync  at
        src/mesa/state_tracker/st_cb_syncobj.c:155

so just don't do the call when the function pointers are not set.

Fixes dEQP:
   dEQP-GLES3.functional.fence_sync.wait_sync_smalldraw
   dEQP-GLES3.functional.fence_sync.wait_sync_largedraw

Fixes: d1a1c21e7621b5177febf191fcd3d3b8ef69dc96
   virgl: native fence fd support

Signed-off-by: Gert Wollny <gert.wol...@collabora.com>
---
  src/gallium/drivers/virgl/virgl_context.c | 6 ++++--
  1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/virgl/virgl_context.c 
b/src/gallium/drivers/virgl/virgl_context.c
index 892fef76c7..f0ee64c145 100644
--- a/src/gallium/drivers/virgl/virgl_context.c
+++ b/src/gallium/drivers/virgl/virgl_context.c
@@ -1037,7 +1037,8 @@ static void virgl_create_fence_fd(struct pipe_context 
*ctx,
     assert(type == PIPE_FD_TYPE_NATIVE_SYNC);
     struct virgl_screen *rs = virgl_screen(ctx->screen);
- *fence = rs->vws->cs_create_fence(rs->vws, fd);
+   if (rs->vws->cs_create_fence)
+      *fence = rs->vws->cs_create_fence(rs->vws, fd);
  }
static void virgl_fence_server_sync(struct pipe_context *ctx,
@@ -1046,7 +1047,8 @@ static void virgl_fence_server_sync(struct pipe_context 
*ctx,
     struct virgl_context *vctx = virgl_context(ctx);
     struct virgl_screen *rs = virgl_screen(ctx->screen);
- rs->vws->fence_server_sync(rs->vws, vctx->cbuf, fence);
+   if (rs->vws->fence_server_sync)
+      rs->vws->fence_server_sync(rs->vws, vctx->cbuf, fence);
  }
static void virgl_set_shader_images(struct pipe_context *ctx,

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