Subject: [PATCH] ppc4xx: ocm: fix errnous "failed to create file" errors

From: Christian Lamparter <[email-masked]>
Date: Sun, 28 Oct 2018 17:17:02 +0100

Previously, the kernel would complain:

| debugfs ppc4xx ocm: failed to create file

But the "info" file was still created and working. This
is because debugfs_create_file() returns a pointer to a
struct *dentry on success or -ENODEV when debugfs isn't
available. This patch fixes both the debugfs_create_dir()
and debugfs_create_file() check, so this will work as
expected.

Signed-off-by: Christian Lamparter <[email-masked]>
---
 arch/powerpc/platforms/4xx/ocm.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/4xx/ocm.c b/arch/powerpc/platforms/4xx/ocm.c
index 69d9f60d9fe5..e616c8636303 100644
--- a/arch/powerpc/platforms/4xx/ocm.c
+++ b/arch/powerpc/platforms/4xx/ocm.c
@@ -293,13 +293,14 @@ static int ocm_debugfs_init(void)
 {
 	struct dentry *junk;
 
-	junk = debugfs_create_dir("ppc4xx_ocm", 0);
-	if (!junk) {
+	junk = debugfs_create_dir("ppc4xx_ocm", NULL);
+	if (IS_ERR_OR_NULL(junk)) {
 		printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n");
 		return -1;
 	}
 
-	if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) {
+	if (IS_ERR_OR_NULL(debugfs_create_file("info", 0644, junk, NULL,
+					       &ocm_debugfs_fops))) {
 		printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n");
 		return -1;
 	}
-- 
2.19.1