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Subject[PATCH] drm/ttm: optimize errors checking and free _manager when finishing
Date
In the function ttm_page_alloc_init, kzalloc call is made for variable
_manager, we need to check its return value, it may return NULL.

In the function ttm_page_alloc_fini, we need to call kfree for variable
_manager, instead of make _manager NULL directly.

Signed-off-by: Xiongwei Song <sxwjean@gmail.com>
---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index b5ba6441489f..e20a0b8e352b 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -1007,6 +1007,10 @@ int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages)
pr_info("Initializing pool allocator\n");

_manager = kzalloc(sizeof(*_manager), GFP_KERNEL);
+ if (!_manager) {
+ ret = -ENOMEM;
+ goto out;
+ }

ttm_page_pool_init_locked(&_manager->wc_pool, GFP_HIGHUSER, "wc", 0);

@@ -1034,13 +1038,17 @@ int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages)
&glob->kobj, "pool");
if (unlikely(ret != 0)) {
kobject_put(&_manager->kobj);
- _manager = NULL;
- return ret;
+ goto out_free_mgr;
}

ttm_pool_mm_shrink_init(_manager);

return 0;
+out_free_mgr:
+ kfree(_manager);
+ _manager = NULL;
+out:
+ return ret;
}

void ttm_page_alloc_fini(void)
@@ -1055,6 +1063,7 @@ void ttm_page_alloc_fini(void)
ttm_page_pool_free(&_manager->pools[i], FREE_ALL_PAGES, true);

kobject_put(&_manager->kobj);
+ kfree(_manager);
_manager = NULL;
}

--
2.15.1
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