This is a note to let you know that I've just added the patch titled
drm/ttm: fix kref count mess in ttm_bo_move_to_lru_tail
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-ttm-fix-kref-count-mess-in-ttm_bo_move_to_lru_tail.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 56fc350224f16901db709cd8cba86bac751aa2a2 Mon Sep 17 00:00:00 2001
From: Flora Cui <Flora.Cui@xxxxxxx>
Date: Wed, 20 Apr 2016 10:23:47 +0800
Subject: drm/ttm: fix kref count mess in ttm_bo_move_to_lru_tail
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From: Flora Cui <Flora.Cui@xxxxxxx>
commit 56fc350224f16901db709cd8cba86bac751aa2a2 upstream.
Fixes the following scenario:
1. Page table bo allocated in vram and linked to man->lru.
tbo->list_kref.refcount=2
2. Page table bo is swapped out and removed from man->lru.
tbo->list_kref.refcount=1
3. Command submission from userspace. Page table bo is moved
to vram. ttm_bo_move_to_lru_tail() link it to man->lru and
don't increase the kref count.
Reviewed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Signed-off-by: Flora Cui <Flora.Cui@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 17 ++++-------------
1 file changed, 4 insertions(+), 13 deletions(-)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -230,22 +230,13 @@ EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
{
- struct ttm_bo_device *bdev = bo->bdev;
- struct ttm_mem_type_manager *man;
+ int put_count = 0;
lockdep_assert_held(&bo->resv->lock.base);
- if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
- list_del_init(&bo->swap);
- list_del_init(&bo->lru);
-
- } else {
- if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG))
- list_move_tail(&bo->swap, &bo->glob->swap_lru);
-
- man = &bdev->man[bo->mem.mem_type];
- list_move_tail(&bo->lru, &man->lru);
- }
+ put_count = ttm_bo_del_from_lru(bo);
+ ttm_bo_list_ref_sub(bo, put_count, true);
+ ttm_bo_add_to_lru(bo);
}
EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
Patches currently in stable-queue which might be from Flora.Cui@xxxxxxx are
queue-4.5/drm-ttm-fix-kref-count-mess-in-ttm_bo_move_to_lru_tail.patch
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