[PATCH 4/4] agp/intel-gtt: extract mch buffer flush in i830 chipset flush

[Daniel Vetter <daniel.vetter@ffwll.ch>]

Just a small clean up. The real fix will add tons of code here,
so it's nice to shrink the function a tad bit, first.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/char/agp/intel-gtt.c |   24 ++++++++++++++++--------
 1 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index bed0ed6..0277314 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -808,6 +808,20 @@ setup:
 	intel_private.i8xx_cache_flush_num = 0;
 }
 
+static void intel_flush_mch_write_buffer(void)
+{
+	memset(intel_private.i8xx_cpu_flush_page, 0,
+	       I830_MCH_WRITE_BUFFER_SIZE);
+
+	mb();
+	if (cpu_has_clflush) {
+		clflush_cache_range(intel_private.i8xx_cpu_flush_page,
+				    I830_MCH_WRITE_BUFFER_SIZE);
+	} else if (wbinvd_on_all_cpus() != 0)
+		printk(KERN_ERR "Timed out waiting for cache flush.\n");
+	mb();
+}
+
 /* The chipset_flush interface needs to get data that has already been
  * flushed out of the CPU all the way out to main memory, because the GPU
  * doesn't snoop those buffers.
@@ -846,14 +860,8 @@ static void intel_i830_chipset_flush(struct agp_bridge_data *bridge)
 			intel_private.i8xx_gtt_cc_pages + offset1);
 	mb();
 
-	memset(intel_private.i8xx_cpu_flush_page, 0,
-	       I830_MCH_WRITE_BUFFER_SIZE);
-
-	if (cpu_has_clflush) {
-		clflush_cache_range(intel_private.i8xx_cpu_flush_page,
-				    I830_MCH_WRITE_BUFFER_SIZE);
-	} else if (wbinvd_on_all_cpus() != 0)
-		printk(KERN_ERR "Timed out waiting for cache flush.\n");
+	/* start chipset flush */
+	intel_flush_mch_write_buffer();
 
 	/* read check values */
 	mb();
-- 
1.7.1