[PATCH] drm/cma: remove to make sg_table when gem cma is created

[Joonyoung Shim]

The sg_table made when gem cma is created isn't used anywhere. The sgt
of struct drm_gem_cma_object will have only sg_tabel imported.

Signed-off-by: Joonyoung Shim <jy0922.shim at samsung.com>
---
 drivers/gpu/drm/drm_gem_cma_helper.c | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c 
b/drivers/gpu/drm/drm_gem_cma_helper.c
index 6b51bf9..2c07cb9 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -79,7 +79,6 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct 
drm_device *drm,
                unsigned int size)
 {
        struct drm_gem_cma_object *cma_obj;
-       struct sg_table *sgt = NULL;
        int ret;

        size = round_up(size, PAGE_SIZE);
@@ -97,23 +96,9 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct 
drm_device *drm,
                goto error;
        }

-       sgt = kzalloc(sizeof(*cma_obj->sgt), GFP_KERNEL);
-       if (sgt == NULL) {
-               ret = -ENOMEM;
-               goto error;
-       }
-
-       ret = dma_get_sgtable(drm->dev, sgt, cma_obj->vaddr,
-                             cma_obj->paddr, size);
-       if (ret < 0)
-               goto error;
-
-       cma_obj->sgt = sgt;
-
        return cma_obj;

 error:
-       kfree(sgt);
        drm_gem_cma_free_object(&cma_obj->base);
        return ERR_PTR(ret);
 }
@@ -175,10 +160,6 @@ void drm_gem_cma_free_object(struct drm_gem_object 
*gem_obj)
        if (cma_obj->vaddr) {
                dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
                                      cma_obj->vaddr, cma_obj->paddr);
-               if (cma_obj->sgt) {
-                       sg_free_table(cma_obj->sgt);
-                       kfree(cma_obj->sgt);
-               }
        } else if (gem_obj->import_attach) {
                drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
        }
-- 
1.8.1.2