linux-kernel - [PATCH 4/4] GPU-DRM-Etnaviv: Optimize error handling in etnaviv_gem_new

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Date:	Fri, 22 Jul 2016 17:51:22 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	dri-devel@...ts.freedesktop.org,
	Christian Gmeiner <christian.gmeiner@...il.com>,
	David Airlie <airlied@...ux.ie>,
	Lucas Stach <l.stach@...gutronix.de>,
	Russell King <linux+etnaviv@...linux.org.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 4/4] GPU-DRM-Etnaviv: Optimize error handling in
 etnaviv_gem_new_userptr()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 22 Jul 2016 17:17:48 +0200

Refactor this function implementation so that the
drm_gem_object_unreference_unlocked() function will only be called once
in case of a failure according to the Linux coding style recommendation
for centralized exiting of functions.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index 0a5c00c..007577c 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -909,15 +909,12 @@ int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 	get_task_struct(current);
 
 	ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
-	if (ret) {
-		drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
-		return ret;
-	}
+	if (ret)
+		goto unreference;
 
 	ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
-
+unreference:
 	/* drop reference from allocate - handle holds it now */
 	drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
-
 	return ret;
 }
-- 
2.9.2