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

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Date:   Fri, 30 Oct 2020 09:03:57 +0530
From:   Deepak R Varma <mh12gx2825@...il.com>
To:     outreachy-kernel@...glegroups.com,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Vincent Abriou <vincent.abriou@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        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/sti: 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/sti/sti_drv.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c
index 3f54efa36098..18c6639e4dbf 100644
--- a/drivers/gpu/drm/sti/sti_drv.c
+++ b/drivers/gpu/drm/sti/sti_drv.c
@@ -68,8 +68,8 @@ static int sti_drm_fps_set(void *data, u64 val)
 	return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
-			sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(sti_drm_fps_fops, sti_drm_fps_get,
+			 sti_drm_fps_set, "%llu\n");
 
 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
 {
@@ -98,8 +98,8 @@ static void sti_drm_dbg_init(struct drm_minor *minor)
 				 ARRAY_SIZE(sti_drm_dbg_list),
 				 minor->debugfs_root, minor);
 
-	debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root,
-			    minor->dev, &sti_drm_fps_fops);
+	debugfs_create_file_unsafe("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root,
+				   minor->dev, &sti_drm_fps_fops);
 
 	DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
 }
-- 
2.25.1