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From: Oleksandr Andrushchenko <andr2000@gmail.com>
To: xen-devel@lists.xenproject.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, boris.ostrovsky@oracle.com,
	jgross@suse.com, airlied@linux.ie, daniel@ffwll.ch
Cc: intel-gfx@lists.freedesktop.org, sstabellini@kernel.org,
	dan.carpenter@oracle.com,
	Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Subject: [PATCH 2/6] drm/xen-front: Fix misused IS_ERR_OR_NULL checks
Date: Fri, 31 Jul 2020 15:51:05 +0300
Message-ID: <20200731125109.18666-3-andr2000@gmail.com> (raw)
In-Reply-To: <20200731125109.18666-1-andr2000@gmail.com>

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

The patch c575b7eeb89f: "drm/xen-front: Add support for Xen PV
display frontend" from Apr 3, 2018, leads to the following static
checker warning:

	drivers/gpu/drm/xen/xen_drm_front_gem.c:140 xen_drm_front_gem_create()
	warn: passing zero to 'ERR_CAST'

drivers/gpu/drm/xen/xen_drm_front_gem.c
   133  struct drm_gem_object *xen_drm_front_gem_create(struct drm_device *dev,
   134                                                  size_t size)
   135  {
   136          struct xen_gem_object *xen_obj;
   137
   138          xen_obj = gem_create(dev, size);
   139          if (IS_ERR_OR_NULL(xen_obj))
   140                  return ERR_CAST(xen_obj);

Fix this and the rest of misused places with IS_ERR_OR_NULL in the
driver.

Fixes:  c575b7eeb89f: "drm/xen-front: Add support for Xen PV display frontend"

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/gpu/drm/xen/xen_drm_front.c     | 4 ++--
 drivers/gpu/drm/xen/xen_drm_front_gem.c | 8 ++++----
 drivers/gpu/drm/xen/xen_drm_front_kms.c | 2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c
index 3e660fb111b3..88db2726e8ce 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.c
+++ b/drivers/gpu/drm/xen/xen_drm_front.c
@@ -400,8 +400,8 @@ static int xen_drm_drv_dumb_create(struct drm_file *filp,
 	args->size = args->pitch * args->height;
 
 	obj = xen_drm_front_gem_create(dev, args->size);
-	if (IS_ERR_OR_NULL(obj)) {
-		ret = PTR_ERR_OR_ZERO(obj);
+	if (IS_ERR(obj)) {
+		ret = PTR_ERR(obj);
 		goto fail;
 	}
 
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
index f0b85e094111..4ec8a49241e1 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
@@ -83,7 +83,7 @@ static struct xen_gem_object *gem_create(struct drm_device *dev, size_t size)
 
 	size = round_up(size, PAGE_SIZE);
 	xen_obj = gem_create_obj(dev, size);
-	if (IS_ERR_OR_NULL(xen_obj))
+	if (IS_ERR(xen_obj))
 		return xen_obj;
 
 	if (drm_info->front_info->cfg.be_alloc) {
@@ -117,7 +117,7 @@ static struct xen_gem_object *gem_create(struct drm_device *dev, size_t size)
 	 */
 	xen_obj->num_pages = DIV_ROUND_UP(size, PAGE_SIZE);
 	xen_obj->pages = drm_gem_get_pages(&xen_obj->base);
-	if (IS_ERR_OR_NULL(xen_obj->pages)) {
+	if (IS_ERR(xen_obj->pages)) {
 		ret = PTR_ERR(xen_obj->pages);
 		xen_obj->pages = NULL;
 		goto fail;
@@ -136,7 +136,7 @@ struct drm_gem_object *xen_drm_front_gem_create(struct drm_device *dev,
 	struct xen_gem_object *xen_obj;
 
 	xen_obj = gem_create(dev, size);
-	if (IS_ERR_OR_NULL(xen_obj))
+	if (IS_ERR(xen_obj))
 		return ERR_CAST(xen_obj);
 
 	return &xen_obj->base;
@@ -194,7 +194,7 @@ xen_drm_front_gem_import_sg_table(struct drm_device *dev,
 
 	size = attach->dmabuf->size;
 	xen_obj = gem_create_obj(dev, size);
-	if (IS_ERR_OR_NULL(xen_obj))
+	if (IS_ERR(xen_obj))
 		return ERR_CAST(xen_obj);
 
 	ret = gem_alloc_pages_array(xen_obj, size);
diff --git a/drivers/gpu/drm/xen/xen_drm_front_kms.c b/drivers/gpu/drm/xen/xen_drm_front_kms.c
index 78096bbcd226..ef11b1e4de39 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_kms.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_kms.c
@@ -60,7 +60,7 @@ fb_create(struct drm_device *dev, struct drm_file *filp,
 	int ret;
 
 	fb = drm_gem_fb_create_with_funcs(dev, filp, mode_cmd, &fb_funcs);
-	if (IS_ERR_OR_NULL(fb))
+	if (IS_ERR(fb))
 		return fb;
 
 	gem_obj = fb->obj[0];
-- 
2.17.1



  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31 12:51 [PATCH 0/6] Fixes and improvements for Xen pvdrm Oleksandr Andrushchenko
2020-07-31 12:51 ` [PATCH 1/6] xen/gntdev: Fix dmabuf import with non-zero sgt offset Oleksandr Andrushchenko
2020-08-04  6:11   ` Jürgen Groß
2020-08-04  6:34     ` Oleksandr Andrushchenko
2020-07-31 12:51 ` Oleksandr Andrushchenko [this message]
2020-08-04  6:12   ` [PATCH 2/6] drm/xen-front: Fix misused IS_ERR_OR_NULL checks Jürgen Groß
2020-08-04  6:35     ` Oleksandr Andrushchenko
2020-08-04  6:39       ` Jürgen Groß
2020-08-06  9:20       ` Dan Carpenter
2020-08-06  9:17   ` Dan Carpenter
2020-07-31 12:51 ` [PATCH 3/6] drm/xen-front: Add YUYV to supported formats Oleksandr Andrushchenko
2020-08-07  9:35   ` Noralf Trønnes
2020-07-31 12:51 ` [PATCH 4/6] xen: Sync up with the canonical protocol definition in Xen Oleksandr Andrushchenko
2020-08-04  6:14   ` Jürgen Groß
2020-07-31 12:51 ` [PATCH 5/6] drm/xen-front: Pass dumb buffer data offset to the backend Oleksandr Andrushchenko
2020-08-07  9:33   ` Noralf Trønnes
2020-07-31 12:51 ` [PATCH 6/6] drm/xen-front: Add support for EDID based configuration Oleksandr Andrushchenko
2020-08-05 14:35   ` [Intel-gfx] " kernel test robot

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