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Fix refcounting bugs in swap code.

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This commit is contained in:
Thomas Hellstrom 2009-02-13 22:06:48 +01:00
parent 8be10a790e
commit 99825d5eac
1 changed files with 3 additions and 2 deletions
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5
linux-core/ttm/ttm_bo.c
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@ -1637,7 +1637,7 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
bo = list_first_entry(&bdev->swap_lru,
struct ttm_buffer_object, swap);
ttm_bo_reference(bo);
kref_get(&bo->list_kref);
/**
* Reserve buffer. Since we unlock while sleeping, we need
@ -1649,6 +1649,7 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
if (unlikely(ret == -EBUSY)) {
spin_unlock(&bdev->lru_lock);
ttm_bo_wait_unreserved(bo, false);
kref_put(&bo->list_kref, ttm_bo_release_list);
spin_lock(&bdev->lru_lock);
}
}
@ -1703,7 +1704,7 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
atomic_set(&bo->reserved, 0);
wake_up_all(&bo->event_queue);
ttm_bo_unref(&bo);
kref_put(&bo->list_kref, ttm_bo_release_list);
return ret;
}