linux-kernel - [PATCH] drm/xen-front: Replace NULL with error value in xen_drm_front_gem_get_sg

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Message-Id: <20180615095409.5685-1-andr2000@gmail.com>
Date:   Fri, 15 Jun 2018 12:54:09 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, airlied@...ux.ie,
        daniel.vetter@...el.com, seanpaul@...omium.org,
        gustavo@...ovan.org, jgross@...e.com, boris.ostrovsky@...cle.com,
        dan.carpenter@...cle.com
Cc:     andr2000@...il.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: [PATCH] drm/xen-front: Replace NULL with error value in xen_drm_front_gem_get_sg_table

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.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,

And one of the problematic functions is xen_drm_front_gem_get_sg_table.
Fix this by replacing NULL with error value.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/gpu/drm/xen/xen_drm_front_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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);
 }
-- 
2.17.1