From 29e3ffd4f5309dcdcea7f9246b77620068e6a05d Mon Sep 17 00:00:00 2001
From: Robert Noland <rnoland@FreeBSD.org>
Date: Fri, 30 Oct 2009 18:07:22 +0000
Subject: [PATCH] A bit of cleanup work on radeon_freelist_get()

  * Fix the main loop to search all buffers before sleeping.
  * Remove dead code

MFC after:	3 days
---
 sys/dev/drm/radeon_cp.c | 45 ++++-------------------------------------
 1 file changed, 4 insertions(+), 41 deletions(-)

diff --git a/sys/dev/drm/radeon_cp.c b/sys/dev/drm/radeon_cp.c
index 734fafa445fb..2e85f115a6d4 100644
--- a/sys/dev/drm/radeon_cp.c
+++ b/sys/dev/drm/radeon_cp.c
@@ -1860,8 +1860,8 @@ struct drm_buf *radeon_freelist_get(struct drm_device * dev)
 	for (t = 0; t < dev_priv->usec_timeout; t++) {
 		u32 done_age = GET_SCRATCH(dev_priv, 1);
 		DRM_DEBUG("done_age = %d\n", done_age);
-		for (i = start; i < dma->buf_count; i++) {
-			buf = dma->buflist[i];
+		for (i = 0; i < dma->buf_count; i++) {
+			buf = dma->buflist[start];
 			buf_priv = buf->dev_private;
 			if (buf->file_priv == NULL || (buf->pending &&
 						       buf_priv->age <=
@@ -1870,7 +1870,8 @@ struct drm_buf *radeon_freelist_get(struct drm_device * dev)
 				buf->pending = 0;
 				return buf;
 			}
-			start = 0;
+			if (++start >= dma->buf_count)
+				start = 0;
 		}
 
 		if (t) {
@@ -1879,47 +1880,9 @@ struct drm_buf *radeon_freelist_get(struct drm_device * dev)
 		}
 	}
 
-	DRM_DEBUG("returning NULL!\n");
 	return NULL;
 }
 
-#if 0
-struct drm_buf *radeon_freelist_get(struct drm_device * dev)
-{
-	struct drm_device_dma *dma = dev->dma;
-	drm_radeon_private_t *dev_priv = dev->dev_private;
-	drm_radeon_buf_priv_t *buf_priv;
-	struct drm_buf *buf;
-	int i, t;
-	int start;
-	u32 done_age;
-
-	done_age = radeon_read_ring_rptr(dev_priv, RADEON_SCRATCHOFF(1));
-	if (++dev_priv->last_buf >= dma->buf_count)
-		dev_priv->last_buf = 0;
-
-	start = dev_priv->last_buf;
-	dev_priv->stats.freelist_loops++;
-
-	for (t = 0; t < 2; t++) {
-		for (i = start; i < dma->buf_count; i++) {
-			buf = dma->buflist[i];
-			buf_priv = buf->dev_private;
-			if (buf->file_priv == 0 || (buf->pending &&
-						    buf_priv->age <=
-						    done_age)) {
-				dev_priv->stats.requested_bufs++;
-				buf->pending = 0;
-				return buf;
-			}
-		}
-		start = 0;
-	}
-
-	return NULL;
-}
-#endif
-
 void radeon_freelist_reset(struct drm_device * dev)
 {
 	struct drm_device_dma *dma = dev->dma;