Fix ring space calculations, tests. Based on patch by Bruce Stockwell.

1 files changed, 2 insertions, 17 deletions

diff --git a/linux/radeon_cp.c b/linux/radeon_cp.c
index 3feb4b24..cea8c327 100644
--- a/linux/radeon_cp.c
+++ b/linux/radeon_cp.c
@@ -1166,13 +1166,9 @@ int radeon_wait_ring( drm_radeon_private_t *dev_priv, int n )
 	int i;
 
 	for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
-		ring->space = *ring->head - ring->tail;
-		if ( ring->space <= 0 )
-			ring->space += ring->size;
-
-		if ( ring->space >= n )
+		radeon_update_ring_snapshot( ring );
+		if ( ring->space > n )
 			return 0;
-
 		udelay( 1 );
 	}
 
@@ -1181,17 +1177,6 @@ int radeon_wait_ring( drm_radeon_private_t *dev_priv, int n )
 	return -EBUSY;
 }
 
-void radeon_update_ring_snapshot( drm_radeon_private_t *dev_priv )
-{
-	drm_radeon_ring_buffer_t *ring = &dev_priv->ring;
-
-	ring->space = *ring->head - ring->tail;
-	if ( ring->space == 0 )
-		atomic_inc( &dev_priv->idle_count );
-	if ( ring->space <= 0 )
-		ring->space += ring->size;
-}
-
 static int radeon_cp_get_buffers( drm_device_t *dev, drm_dma_t *d )
 {
 	int i;