linux-kernel - [PATCH] drm/amdgpu: Delete an unnecessary check before two function calls

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <a3739125-5fa8-cadb-d2b8-8a9f12e9bacd@web.de>
Date:   Wed, 4 Sep 2019 13:00:27 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Chunming Zhou <David1.Zhou@....com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Hawking Zhang <Hawking.Zhang@....com>,
        Jack Xiao <Jack.Xiao@....com>,
        Kevin Wang <Kevin1.Wang@....com>,
        Tom St Denis <tom.stdenis@....com>,
        Wang Xiayang <xywang.sjtu@...u.edu.cn>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] drm/amdgpu: Delete an unnecessary check before two function
 calls

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 4 Sep 2019 12:30:23 +0200

The functions “debugfs_remove” and “kfree” test whether their argument
is NULL and then return immediately.
Thus the tests around the shown calls are not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index 5652cc72ed3a..d321c72d63d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -1076,10 +1076,7 @@ static int amdgpu_debugfs_ib_preempt(void *data, u64 val)
 	kthread_unpark(ring->sched.thread);

 	ttm_bo_unlock_delayed_workqueue(&adev->mman.bdev, resched);
-
-	if (fences)
-		kfree(fences);
-
+	kfree(fences);
 	return 0;
 }

@@ -1103,8 +1100,7 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)

 void amdgpu_debugfs_preempt_cleanup(struct amdgpu_device *adev)
 {
-	if (adev->debugfs_preempt)
-		debugfs_remove(adev->debugfs_preempt);
+	debugfs_remove(adev->debugfs_preempt);
 }

 #else
--
2.23.0