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

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

[Markus Elfring]

From: Markus Elfring <elfring@users.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@users.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

Re: drm/amdgpu: Delete an unnecessary check before two function calls

[Markus Elfring]

> 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.

I suggest to take another look at a similar patch.

drm/amdgpu: remove the redundant null check
https://lkml.org/lkml/2019/9/3/59
https://lore.kernel.org/patchwork/patch/1123118/
https://lore.kernel.org/r/1567491305-18320-1-git-send-email-zhongjiang@huawei.com/

Regards,
Markus