drivers/gpu/drm/ttm/ttm_page_alloc_dma.c: Remove useless kfree

Remove useless kfree() and clean up code related to the removal.

The semantic patch that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
position p1,p2;
expression x;
@@

if (x@p1 == NULL) { ... kfree@p2(x); ... return ...; }

@unchanged exists@
position r.p1,r.p2;
expression e <= r.x,x,e1;
iterator I;
statement S;
@@

if (x@p1 == NULL) { ... when != I(x,...) S
                        when != e = e1
                        when != e += e1
                        when != e -= e1
                        when != ++e
                        when != --e
                        when != e++
                        when != e--
                        when != &e
   kfree@p2(x); ... return ...; }

@ok depends on unchanged exists@
position any r.p1;
position r.p2;
expression x;
@@

... when != true x@p1 == NULL
kfree@p2(x);

@depends on !ok && unchanged@
position r.p2;
expression x;
@@

*kfree@p2(x);
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index 4f9e548b2eec67e5a701f7017bb7a4ff95fb2f99..969d765320885cf45da6f9ea3a566e12ae21e6d3 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -1060,7 +1060,7 @@ int ttm_dma_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages)
 
        _manager = kzalloc(sizeof(*_manager), GFP_KERNEL);
        if (!_manager)
-               goto err_manager;
+               goto err;
 
        mutex_init(&_manager->lock);
        INIT_LIST_HEAD(&_manager->pools);
@@ -1078,9 +1078,6 @@ int ttm_dma_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages)
        }
        ttm_dma_pool_mm_shrink_init(_manager);
        return 0;
-err_manager:
-       kfree(_manager);
-       _manager = NULL;
 err:
        return ret;
 }