[PATCH 1/2] drm/ttm: fix object deallocation to properly fill in the page pool.

[j.glisse at gmail.com]

From: Jérôme Glisse <jglisse at redhat.com>

Current code never allowed the page pool to actualy fill in anyway.
This fix it, so that we only start freeing page from the pool when
we go over the pool size.

Signed-off-by: Jérôme Glisse <jglisse at redhat.com>
Reviewed-by: Mario Kleiner <mario.kleiner.de at gmail.com>
Tested-by: Michel Dänzer <michel at daenzer.net>
Cc: Thomas Hellstrom <thellstrom at vmware.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
---
 drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index c96db43..0194a93 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -953,14 +953,8 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
 	} else {
 		pool->npages_free += count;
 		list_splice(&ttm_dma->pages_list, &pool->free_list);
-		npages = count;
-		if (pool->npages_free > _manager->options.max_size) {
+		if (pool->npages_free > _manager->options.max_size)
 			npages = pool->npages_free - _manager->options.max_size;
-			/* free at least NUM_PAGES_TO_ALLOC number of pages
-			 * to reduce calls to set_memory_wb */
-			if (npages < NUM_PAGES_TO_ALLOC)
-				npages = NUM_PAGES_TO_ALLOC;
-		}
 	}
 	spin_unlock_irqrestore(&pool->lock, irq_flags);
 
-- 
1.8.3.1