From 4b558281e04e4d4febfc361632a90f8a45080c49 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 2 Sep 2012 12:23:59 +0100
Subject: [PATCH] sna: Don't retire when searching for a snoopable buffer
 without hw support

If the hw/kernel doesn't support snoopable buffers, then it makes little
sense to search for one, and force a retire in the certainty of not
finding any.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/sna/kgem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index 6df5a2e5..cb0c82a7 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -1375,6 +1375,9 @@ search_snoop_cache(struct kgem *kgem, unsigned int num_pages, unsigned flags)
 
 	DBG(("%s: num_pages=%d, flags=%x\n", __FUNCTION__, num_pages, flags));
 
+	if ((kgem->has_cacheing | kgem->has_userptr) == 0)
+		return NULL;
+
 	if (list_is_empty(&kgem->snoop)) {
 		DBG(("%s: inactive and cache empty\n", __FUNCTION__));
 		if (!__kgem_throttle_retire(kgem, flags)) {