linux-kernel - [PATCH 3.16.y-ckt 052/254] drm/nvc0-/fb/ram: fix use of non-existant ram if partitions aren't uniform

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Date:	Tue, 25 Nov 2014 10:36:42 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ben Skeggs <bskeggs@...hat.com>, Sven Joachim <svenjoac@....de>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 052/254] drm/nvc0-/fb/ram: fix use of non-existant ram if partitions aren't uniform

3.16.7-ckt2 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit 3d9e3921f4d77bcaeea913c48b894d1208f0cb06 upstream.

Likely a large part of the GK106 woes..

Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Cc: Sven Joachim <svenjoac@....de>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/gpu/drm/nouveau/core/subdev/fb/ramnvc0.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/core/subdev/fb/ramnvc0.c b/drivers/gpu/drm/nouveau/core/subdev/fb/ramnvc0.c
index 5a6a5027f749..cd9920591a21 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/fb/ramnvc0.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/fb/ramnvc0.c
@@ -554,13 +554,13 @@ nvc0_ram_create_(struct nouveau_object *parent, struct nouveau_object *engine,
 	} else {
 		/* otherwise, address lowest common amount from 0GiB */
 		ret = nouveau_mm_init(&pfb->vram, rsvd_head,
-				      (bsize << 8) * parts, 1);
+				      (bsize << 8) * parts - rsvd_head, 1);
 		if (ret)
 			return ret;
 
 		/* and the rest starting from (8GiB + common_size) */
 		offset = (0x0200000000ULL >> 12) + (bsize << 8);
-		length = (ram->size >> 12) - (bsize << 8) - rsvd_tail;
+		length = (ram->size >> 12) - ((bsize * parts) << 8) - rsvd_tail;
 
 		ret = nouveau_mm_init(&pfb->vram, offset, length, 0);
 		if (ret)
-- 
2.1.0

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