linux-kernel - [PATCH v1] drivers:thermal:Fix the NULL vs IS_ERR() bug for debugfs_create

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Message-Id: <20240821075934.12145-1-11162571@vivo.com>
Date: Wed, 21 Aug 2024 03:59:33 -0400
From: Yang Ruibin <11162571@...o.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Lukasz Luba <lukasz.luba@....com>,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com,
	Yang Ruibin <11162571@...o.com>
Subject: [PATCH v1] drivers:thermal:Fix the NULL vs IS_ERR() bug for debugfs_create_dir()

The debugfs_create_dir() function returns error pointers.
It never returns NULL. So use IS_ERR() to check it.

Signed-off-by: Yang Ruibin <11162571@...o.com>
---
 drivers/thermal/thermal_debugfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/thermal/thermal_debugfs.c b/drivers/thermal/thermal_debugfs.c
index 7dd67bf48571..939d3e5f1817 100644
--- a/drivers/thermal/thermal_debugfs.c
+++ b/drivers/thermal/thermal_debugfs.c
@@ -178,11 +178,11 @@ struct thermal_debugfs {
 void thermal_debug_init(void)
 {
 	d_root = debugfs_create_dir("thermal", NULL);
-	if (!d_root)
+	if (IS_ERR(d_root))
 		return;
 
 	d_cdev = debugfs_create_dir("cooling_devices", d_root);
-	if (!d_cdev)
+	if (IS_ERR(d_cdev))
 		return;
 
 	d_tz = debugfs_create_dir("thermal_zones", d_root);
@@ -202,7 +202,7 @@ static struct thermal_debugfs *thermal_debugfs_add_id(struct dentry *d, int id)
 	snprintf(ids, IDSLENGTH, "%d", id);
 
 	thermal_dbg->d_top = debugfs_create_dir(ids, d);
-	if (!thermal_dbg->d_top) {
+	if (IS_ERR(thermal_dbg->d_top)) {
 		kfree(thermal_dbg);
 		return NULL;
 	}
-- 
2.34.1