drm/ttm: Fix potential ttm_mem_evict_first races.

1) The function was previously called with a potentially empty
LRU list which would have lead to an OOPS or servere corruption.
2) In rare cases, after reservation has succeeded, another process may
already have evicted it or even pinned it. We must revalidate the
buffer status after releasing the lru lock.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom 2009-12-02 18:33:46 +01:00 коммит произвёл Dave Airlie
Родитель aaa2073694
Коммит 9c51ba1db3
1 изменённых файлов: 31 добавлений и 5 удалений

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@ -685,19 +685,45 @@ static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
struct ttm_buffer_object *bo;
int ret, put_count = 0;
retry:
spin_lock(&glob->lru_lock);
if (list_empty(&man->lru)) {
spin_unlock(&glob->lru_lock);
return -EBUSY;
}
bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
kref_get(&bo->list_kref);
ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, false, 0);
if (likely(ret == 0))
put_count = ttm_bo_del_from_lru(bo);
ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
if (unlikely(ret == -EBUSY)) {
spin_unlock(&glob->lru_lock);
if (likely(!no_wait))
ret = ttm_bo_wait_unreserved(bo, interruptible);
kref_put(&bo->list_kref, ttm_bo_release_list);
/**
* We *need* to retry after releasing the lru lock.
*/
if (unlikely(ret != 0))
return ret;
goto retry;
}
put_count = ttm_bo_del_from_lru(bo);
spin_unlock(&glob->lru_lock);
if (unlikely(ret != 0))
return ret;
BUG_ON(ret != 0);
while (put_count--)
kref_put(&bo->list_kref, ttm_bo_ref_bug);
ret = ttm_bo_evict(bo, interruptible, no_wait);
ttm_bo_unreserve(bo);
kref_put(&bo->list_kref, ttm_bo_release_list);
return ret;
}