LGTM
Reviewed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
On 04/26/2016 06:50 AM, Alex Deucher wrote:
> Ping. Any objections?
>
>
> On Wed, Apr 20, 2016 at 1:52 PM, Alex Deucher <alexdeucher@xxxxxxxxx> wrote:
>> From: Flora Cui <Flora.Cui@xxxxxxx>
>>
>> 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.
>>
>> Signed-off-by: Flora Cui <Flora.Cui@xxxxxxx>
>> Reviewed-by: Christian König <christian.koenig@xxxxxxx>
>> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
>> Cc: stable@xxxxxxxxxxxxxxx
>> ---
>> drivers/gpu/drm/ttm/ttm_bo.c | 17 ++++-------------
>> 1 file changed, 4 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
>> index 4cbf265..e3daafa 100644
>> --- 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);
>>
>> --
>> 2.5.5
>>
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