From 5af8641ce0d1d725d5eb1df83c8211d2cdbe528c Mon Sep 17 00:00:00 2001
From: Chia-I Wu <olvaffe@gmail.com>
Date: Wed, 15 May 2013 08:50:34 +0800
Subject: [PATCH] ilo: no writeback without PIPE_TRANSFER_WRITE

We should not write staging data back when PIPE_TRANSFER_WRITE is not set.
---
 src/gallium/drivers/ilo/ilo_transfer.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/gallium/drivers/ilo/ilo_transfer.c b/src/gallium/drivers/ilo/ilo_transfer.c
index 3b4a2136c81..3d38fe88452 100644
--- a/src/gallium/drivers/ilo/ilo_transfer.c
+++ b/src/gallium/drivers/ilo/ilo_transfer.c
@@ -188,6 +188,11 @@ tex_staging_sys_unmap(struct ilo_context *ilo,
    struct pipe_transfer *dst_xfer;
    void *dst;
 
+   if (!(xfer->base.usage & PIPE_TRANSFER_WRITE)) {
+      FREE(xfer->staging_sys);
+      return;
+   }
+
    dst = ilo->base.transfer_map(&ilo->base,
          xfer->base.resource, xfer->base.level,
          PIPE_TRANSFER_WRITE |