linux-kernel - [13/27] drm/ttm: ensure ttm for new node is bound before calling move

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Date:	Sun, 23 Oct 2011 08:24:41 +0200
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	stable-review@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Ben Skeggs <bskeggs@...hat.com>,
	Dave Airlie <airlied@...hat.com>,
	Josh Boyer <jwboyer@...hat.com>
Subject: [13/27] drm/ttm: ensure ttm for new node is bound before calling move_notify()

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Ben Skeggs <bskeggs@...hat.com>

commit 8d3bb23609d4ae22803a15d232289fc09a7b61c4 upstream.

This was true for new TTM_PL_SYSTEM and new TTM_PL_TT cases, but wasn't
the case on TTM_PL_SYSTEM<->TTM_PL_TT moves, which causes trouble on some
paths as nouveau's move_notify() hook requires that the dma addresses be
valid at this point.

Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Cc: Josh Boyer <jwboyer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/ttm/ttm_bo.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -392,10 +392,12 @@ static int ttm_bo_handle_move_mem(struct
 	 * Create and bind a ttm if required.
 	 */
 
-	if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
-		ret = ttm_bo_add_ttm(bo, false);
-		if (ret)
-			goto out_err;
+	if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
+		if (bo->ttm == NULL) {
+			ret = ttm_bo_add_ttm(bo, false);
+			if (ret)
+				goto out_err;
+		}
 
 		ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 		if (ret)


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