intel: Restore manual flush for old kernels

Daniel Vetter pointed out that the automagic flush by the kernel for the
busy-ioctl was only introduced upstream in 2.6.37. So we still need to
manually emit a flush on old kernels.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/intel_batchbuffer.c b/src/intel_batchbuffer.c
index 95eca434..289ed2b2 100644
--- a/src/intel_batchbuffer.c
+++ b/src/intel_batchbuffer.c
@@ -175,6 +175,13 @@ void intel_batch_emit_flush(ScrnInfoPtr scrn)
 	intel_batch_do_flush(scrn);
 }
 
+static Bool intel_batch_needs_flush(intel_screen_private *intel)
+{
+	ScreenPtr screen = intel->scrn->pScreen;
+	PixmapPtr pixmap = screen->GetScreenPixmap(screen);
+	return intel_get_pixmap_private(pixmap)->batch_write;
+}
+
 void intel_batch_submit(ScrnInfoPtr scrn)
 {
 	intel_screen_private *intel = intel_get_screen_private(scrn);
@@ -234,6 +241,8 @@ void intel_batch_submit(ScrnInfoPtr scrn)
 		}
 	}
 
+	intel->needs_flush |= intel_batch_needs_flush(intel);
+
 	while (!list_is_empty(&intel->batch_pixmaps)) {
 		struct intel_pixmap *entry;