linux-kernel - [PATCH v2] powerpc:platforms:Fix an NULL vs IS_ERR() bug for debugfs_create

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Date:   Wed, 12 Jul 2023 10:52:35 +0800
From:   Wang Ming <machel@...o.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com, Wang Ming <machel@...o.com>
Subject: [PATCH v2] powerpc:platforms:Fix an NULL vs IS_ERR() bug for debugfs_create_dir()

The debugfs_create_dir() function returns error pointers.
It never returns NULL. Most incorrect error checks were fixed,
but the one in scom_debug_init() was forgotten, the other one in
scom_debug_init_one() was also forgotten.

Fix the remaining error check.

Signed-off-by: Wang Ming <machel@...o.com>

Fixes: bfd2f0d49aef ("powerpc/powernv: Get rid of old scom_controller abstraction")
---
 arch/powerpc/platforms/powernv/opal-xscom.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/opal-xscom.c b/arch/powerpc/platforms/powernv/opal-xscom.c
index 6b4eed2ef4fa..262cd6fac907 100644
--- a/arch/powerpc/platforms/powernv/opal-xscom.c
+++ b/arch/powerpc/platforms/powernv/opal-xscom.c
@@ -168,7 +168,7 @@ static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
 	ent->path.size = strlen((char *)ent->path.data);
 
 	dir = debugfs_create_dir(ent->name, root);
-	if (!dir) {
+	if (IS_ERR(dir)) {
 		kfree(ent->path.data);
 		kfree(ent);
 		return -1;
@@ -190,7 +190,7 @@ static int scom_debug_init(void)
 		return 0;
 
 	root = debugfs_create_dir("scom", arch_debugfs_dir);
-	if (!root)
+	if (IS_ERR(root))
 		return -1;
 
 	rc = 0;
-- 
2.25.1