linux-kernel - [PATCH] drm/amdgpu: use DEFINE_DEBUGFS_ATTRIBUTE with debugfs_create_file

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Date:   Fri, 30 Oct 2020 08:52:45 +0530
From:   Deepak R Varma <mh12gx2825@...il.com>
To:     outreachy-kernel@...glegroups.com,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     mh12gx2825@...il.com, melissa.srw@...il.com, daniel.vetter@...ll.ch
Subject: [PATCH] drm/amdgpu: use DEFINE_DEBUGFS_ATTRIBUTE with
 debugfs_create_file_unsafe()

Using DEFINE_DEBUGFS_ATTRIBUTE macro with debugfs_create_file_unsafe()
function in place of the debugfs_create_file() function will make the
file operation struct "reset" aware of the file's lifetime. Additional
details here: https://lists.archive.carbon60.com/linux/kernel/2369498

Issue reported by Coccinelle script:
scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci

Signed-off-by: Deepak R Varma <mh12gx2825@...il.com>
---
Please Note: This is a Outreachy project task patch.

 drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index 2d125b8b15ee..f076b1ba7319 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -1551,29 +1551,29 @@ static int amdgpu_debugfs_sclk_set(void *data, u64 val)
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(fops_ib_preempt, NULL,
-			amdgpu_debugfs_ib_preempt, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_ib_preempt, NULL,
+			 amdgpu_debugfs_ib_preempt, "%llu\n");
 
-DEFINE_SIMPLE_ATTRIBUTE(fops_sclk_set, NULL,
-			amdgpu_debugfs_sclk_set, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_sclk_set, NULL,
+			 amdgpu_debugfs_sclk_set, "%llu\n");
 
 int amdgpu_debugfs_init(struct amdgpu_device *adev)
 {
 	int r, i;
 
 	adev->debugfs_preempt =
-		debugfs_create_file("amdgpu_preempt_ib", 0600,
-				    adev_to_drm(adev)->primary->debugfs_root, adev,
-				    &fops_ib_preempt);
+		debugfs_create_file_unsafe("amdgpu_preempt_ib", 0600,
+					   adev_to_drm(adev)->primary->debugfs_root, adev,
+					   &fops_ib_preempt);
 	if (!(adev->debugfs_preempt)) {
 		DRM_ERROR("unable to create amdgpu_preempt_ib debugsfs file\n");
 		return -EIO;
 	}
 
 	adev->smu.debugfs_sclk =
-		debugfs_create_file("amdgpu_force_sclk", 0200,
-				    adev_to_drm(adev)->primary->debugfs_root, adev,
-				    &fops_sclk_set);
+		debugfs_create_file_unsafe("amdgpu_force_sclk", 0200,
+					   adev_to_drm(adev)->primary->debugfs_root, adev,
+					   &fops_sclk_set);
 	if (!(adev->smu.debugfs_sclk)) {
 		DRM_ERROR("unable to create amdgpu_set_sclk debugsfs file\n");
 		return -EIO;
-- 
2.25.1