From 8a78f74b2c5dbc49418ebe2c8fde01e17f6ea452 Mon Sep 17 00:00:00 2001
From: "Orczykowski, Juergen" <juergen.orczykowski@siemens.com>
Date: Tue, 8 May 2007 00:37:25 -0700
Subject: [PATCH] --- yaml --- r: 54874 b: refs/heads/master c:
 71c6efd9930bd87249d007120425341d1293303d h: refs/heads/master v: v3

---
 [refs]                                  |  2 +-
 trunk/drivers/video/intelfb/intelfbhw.c | 34 +++++++++++++++----------
 2 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/[refs] b/[refs]
index a2b0a94e1b5e..36ca4c4caeb6 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 33a9f640a2511155517d316e696654b84dd48654
+refs/heads/master: 71c6efd9930bd87249d007120425341d1293303d
diff --git a/trunk/drivers/video/intelfb/intelfbhw.c b/trunk/drivers/video/intelfb/intelfbhw.c
index c1eb18bf0883..16bc8d75e36e 100644
--- a/trunk/drivers/video/intelfb/intelfbhw.c
+++ b/trunk/drivers/video/intelfb/intelfbhw.c
@@ -1428,6 +1428,24 @@ static void refresh_ring(struct intelfb_info *dinfo);
 static void reset_state(struct intelfb_info *dinfo);
 static void do_flush(struct intelfb_info *dinfo);
 
+static  u32 get_ring_space(struct intelfb_info *dinfo)
+{
+	u32 ring_space;
+
+	if (dinfo->ring_tail >= dinfo->ring_head)
+		ring_space = dinfo->ring.size -
+			(dinfo->ring_tail - dinfo->ring_head);
+	else
+		ring_space = dinfo->ring_head - dinfo->ring_tail;
+
+	if (ring_space > RING_MIN_FREE)
+		ring_space -= RING_MIN_FREE;
+	else
+		ring_space = 0;
+
+	return ring_space;
+}
+
 static int
 wait_ring(struct intelfb_info *dinfo, int n)
 {
@@ -1442,13 +1460,8 @@ wait_ring(struct intelfb_info *dinfo, int n)
 	end = jiffies + (HZ * 3);
 	while (dinfo->ring_space < n) {
 		dinfo->ring_head = INREG(PRI_RING_HEAD) & RING_HEAD_MASK;
-		if (dinfo->ring_tail + RING_MIN_FREE < dinfo->ring_head)
-			dinfo->ring_space = dinfo->ring_head
-				- (dinfo->ring_tail + RING_MIN_FREE);
-		else
-			dinfo->ring_space = (dinfo->ring.size +
-					     dinfo->ring_head)
-				- (dinfo->ring_tail + RING_MIN_FREE);
+		dinfo->ring_space = get_ring_space(dinfo);
+
 		if (dinfo->ring_head != last_head) {
 			end = jiffies + (HZ * 3);
 			last_head = dinfo->ring_head;
@@ -1513,12 +1526,7 @@ refresh_ring(struct intelfb_info *dinfo)
 
 	dinfo->ring_head = INREG(PRI_RING_HEAD) & RING_HEAD_MASK;
 	dinfo->ring_tail = INREG(PRI_RING_TAIL) & RING_TAIL_MASK;
-	if (dinfo->ring_tail + RING_MIN_FREE < dinfo->ring_head)
-		dinfo->ring_space = dinfo->ring_head
-			- (dinfo->ring_tail + RING_MIN_FREE);
-	else
-		dinfo->ring_space = (dinfo->ring.size + dinfo->ring_head)
-			- (dinfo->ring_tail + RING_MIN_FREE);
+	dinfo->ring_space = get_ring_space(dinfo);
 }
 
 static void