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drm/nouveau/drm/nv04-nv40/instmem: protect access to priv->heap by mutex

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commit 7512223b1e upstream.

This fixes the list_del corruption reported
at <https://bugzilla.redhat.com/1205985>.

Signed-off-by: Kamil Dudka <kdudka@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kamil Dudka
2015-07-15 22:57:43 +02:00
committed by Greg Kroah-Hartman
parent 53f092abcb
commit 58e8dcc3d2
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv04.c
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@@ -50,7 +50,12 @@ nv04_instobj_dtor(struct nvkm_object *object)
{
struct nv04_instmem_priv *priv = (void *)nvkm_instmem(object);
struct nv04_instobj_priv *node = (void *)object;
struct nvkm_subdev *subdev = (void *)priv;
mutex_lock(&subdev->mutex);
nvkm_mm_free(&priv->heap, &node->mem);
mutex_unlock(&subdev->mutex);
nvkm_instobj_destroy(&node->base);
}
@@ -62,6 +67,7 @@ nv04_instobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
struct nv04_instmem_priv *priv = (void *)nvkm_instmem(parent);
struct nv04_instobj_priv *node;
struct nvkm_instobj_args *args = data;
struct nvkm_subdev *subdev = (void *)priv;
int ret;
if (!args->align)
@@ -72,8 +78,10 @@ nv04_instobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
if (ret)
return ret;
mutex_lock(&subdev->mutex);
ret = nvkm_mm_head(&priv->heap, 0, 1, args->size, args->size,
args->align, &node->mem);
mutex_unlock(&subdev->mutex);
if (ret)
return ret;