gallium/radeon: require both WRITE and FLUSH_EXPLICIT in buffer_flush_region

spotted randomly.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>

diff --git a/src/gallium/drivers/radeon/r600_buffer_common.c b/src/gallium/drivers/radeon/r600_buffer_common.c
index b2289e2..6a4846a 100644 (file)
--- a/src/gallium/drivers/radeon/r600_buffer_common.c
+++ b/src/gallium/drivers/radeon/r600_buffer_common.c
@@ -482,8 +482,10 @@ static void r600_buffer_flush_region(struct pipe_context *ctx,
                                     struct pipe_transfer *transfer,
                                     const struct pipe_box *rel_box)
 {
-       if (transfer->usage & (PIPE_TRANSFER_WRITE |
-                              PIPE_TRANSFER_FLUSH_EXPLICIT)) {
+       unsigned required_usage = PIPE_TRANSFER_WRITE |
+                                 PIPE_TRANSFER_FLUSH_EXPLICIT;
+
+       if ((transfer->usage & required_usage) == required_usage) {
                struct pipe_box box;
 
                u_box_1d(transfer->box.x + rel_box->x, rel_box->width, &box);