On 06/18/2018 09:07 AM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko oleksandr_andrushchenko@epam.com
Dan Carpenter has reported that there is the following static checker warning: drivers/gpu/drm/drm_prime.c:317 drm_gem_map_dma_buf() warn: 'sgt' can also be NULL
314 sgt = obj->dev->driver->gem_prime_get_sg_table(obj); 315 316 if (!IS_ERR(sgt)) { 317 if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
Problematic functions are xen_drm_front_gem_get_sg_table and drm_gem_cma_prime_get_sg_table. Fix those by replacing NULL with error value.
Signed-off-by: Oleksandr Andrushchenko oleksandr_andrushchenko@epam.com Reported-by: Dan Carpenter dan.carpenter@oracle.com
Dan, could you please review?
drivers/gpu/drm/drm_gem_cma_helper.c | 2 +- drivers/gpu/drm/xen/xen_drm_front_gem.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c index 80a5115c3846..ce868ce288fb 100644 --- a/drivers/gpu/drm/drm_gem_cma_helper.c +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -436,7 +436,7 @@ struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); if (!sgt)
return NULL;
return ERR_PTR(-ENOMEM);
Forgot to patch CMA helpers, thus v2
ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr, cma_obj->paddr, obj->size); diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c index c85bfe7571cb..47ff019d3aef 100644 --- a/drivers/gpu/drm/xen/xen_drm_front_gem.c +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c @@ -179,7 +179,7 @@ struct sg_table *xen_drm_front_gem_get_sg_table(struct drm_gem_object *gem_obj) struct xen_gem_object *xen_obj = to_xen_gem_obj(gem_obj);
if (!xen_obj->pages)
return NULL;
return ERR_PTR(-ENOMEM);return drm_prime_pages_to_sg(xen_obj->pages, xen_obj->num_pages); }