From: Haotian Zhang <vulab@iscas.ac.cn>
Date: Thu, 20 Nov 2025 02:40:39 +0000 (+0800)
Subject: mailbox: mailbox-test: Fix debugfs_create_dir error checking
X-Git-Tag: v6.17.11~111
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78db090440c566bad3e4cded514a11ae2f802014;p=thirdparty%2Fkernel%2Fstable.git

mailbox: mailbox-test: Fix debugfs_create_dir error checking

[ Upstream commit 3acf1028f5003731977f750a7070f3321a9cb740 ]

The debugfs_create_dir() function returns ERR_PTR() on error, not NULL.
The current null-check fails to catch errors.

Use IS_ERR() to correctly check for errors.

Fixes: 8ea4484d0c2b ("mailbox: Add generic mechanism for testing Mailbox Controllers")
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index c9dd8c42c0cdf..3a28ab5c42e57 100644
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -268,7 +268,7 @@ static int mbox_test_add_debugfs(struct platform_device *pdev,
 		return 0;
 
 	tdev->root_debugfs_dir = debugfs_create_dir(dev_name(&pdev->dev), NULL);
-	if (!tdev->root_debugfs_dir) {
+	if (IS_ERR(tdev->root_debugfs_dir)) {
 		dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n");
 		return -EINVAL;
 	}