Merge branch develop-3.10

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / ttm / ttm_page_alloc_dma.c

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index b8b394319b45947facd37036817b73ac39a2661c..de1a753b1d563549a652987872a01d995c1782e3 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -1006,9 +1006,9 @@ EXPORT_SYMBOL_GPL(ttm_dma_unpopulate);
 static int ttm_dma_pool_mm_shrink(struct shrinker *shrink,
                                  struct shrink_control *sc)
 {
-       static atomic_t start_pool = ATOMIC_INIT(0);
+       static unsigned start_pool;
        unsigned idx = 0;
-       unsigned pool_offset = atomic_add_return(1, &start_pool);
+       unsigned pool_offset;
        unsigned shrink_pages = sc->nr_to_scan;
        struct device_pools *p;
 
@@ -1016,7 +1016,9 @@ static int ttm_dma_pool_mm_shrink(struct shrinker *shrink,
                return 0;
 
        mutex_lock(&_manager->lock);
-       pool_offset = pool_offset % _manager->npools;
+       if (!_manager->npools)
+               goto out;
+       pool_offset = ++start_pool % _manager->npools;
        list_for_each_entry(p, &_manager->pools, pools) {
                unsigned nr_free;
 
@@ -1033,6 +1035,7 @@ static int ttm_dma_pool_mm_shrink(struct shrinker *shrink,
                         p->pool->dev_name, p->pool->name, current->pid,
                         nr_free, shrink_pages);
        }
+out:
        mutex_unlock(&_manager->lock);
        /* return estimated number of unused pages in pool */
        return ttm_dma_pool_get_num_unused_pages();