[PATCH] drm/prime: replace NULL with error value in drm_prime_pages_to_sg

[Seung-Woo Kim]

From: YoungJun Cho <yj44....@samsung.com>

Instead of NULL, error value is casted with ERR_PTR() for
drm_prime_pages_to_sg() and IS_ERR_OR_NULL() macro is replaced
with IS_ERR() macro for drm_gem_map_dma_buf().

Signed-off-by: YoungJun Cho <yj44.cho at samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312.kim at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
 drivers/gpu/drm/drm_prime.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index f1699e9..a47eab4 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -74,7 +74,7 @@ static struct sg_table *drm_gem_map_dma_buf(struct 
dma_buf_attachment *attach,

        sgt = obj->dev->driver->gem_prime_get_sg_table(obj);

-       if (!IS_ERR_OR_NULL(sgt)) {
+       if (!IS_ERR(sgt)) {
                if (!dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir)) {
                        sg_free_table(sgt);
                        kfree(sgt);
@@ -417,8 +417,10 @@ struct sg_table *drm_prime_pages_to_sg(struct page 
**pages, int nr_pages)
        int ret;

        sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
-       if (!sg)
+       if (!sg) {
+               ret = -ENOMEM;
                goto out;
+       }

        ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
                                nr_pages << PAGE_SHIFT, GFP_KERNEL);
@@ -428,7 +430,7 @@ struct sg_table *drm_prime_pages_to_sg(struct page **pages, 
int nr_pages)
        return sg;
 out:
        kfree(sg);
-       return NULL;
+       return ERR_PTR(ret);
 }
 EXPORT_SYMBOL(drm_prime_pages_to_sg);

-- 
1.7.4.1