[PATCH] edac: no need to check return value of debugfs_create functions

[PATCH] edac: no need to check return value of debugfs_create functions

[Greg Kroah-Hartman]

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Borislav Petkov <bp@alien8.de>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-edac@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/edac/debugfs.c     | 45 ++++++++++----------------------------
 drivers/edac/edac_module.h |  4 ++--
 2 files changed, 13 insertions(+), 36 deletions(-)

diff --git a/drivers/edac/debugfs.c b/drivers/edac/debugfs.c
index 92dbb7e2320c..fd27ea0453a3 100644
--- a/drivers/edac/debugfs.c
+++ b/drivers/edac/debugfs.c
@@ -44,10 +44,6 @@ static const struct file_operations debug_fake_inject_fops = {
 int __init edac_debugfs_init(void)
 {
 	edac_debugfs = debugfs_create_dir("edac", NULL);
-	if (IS_ERR(edac_debugfs)) {
-		edac_debugfs = NULL;
-		return -ENOMEM;
-	}
 	return 0;
 }
 
@@ -56,50 +52,31 @@ void edac_debugfs_exit(void)
 	debugfs_remove_recursive(edac_debugfs);
 }
 
-int edac_create_debugfs_nodes(struct mem_ctl_info *mci)
+void edac_create_debugfs_nodes(struct mem_ctl_info *mci)
 {
-	struct dentry *d, *parent;
+	struct dentry *parent;
 	char name[80];
 	int i;
 
-	if (!edac_debugfs)
-		return -ENODEV;
-
-	d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
-	if (!d)
-		return -ENOMEM;
-	parent = d;
+	parent = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
 
 	for (i = 0; i < mci->n_layers; i++) {
 		sprintf(name, "fake_inject_%s",
 			     edac_layer_name[mci->layers[i].type]);
-		d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
-				      &mci->fake_inject_layer[i]);
-		if (!d)
-			goto nomem;
+		debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
+				  &mci->fake_inject_layer[i]);
 	}
 
-	d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
-				&mci->fake_inject_ue);
-	if (!d)
-		goto nomem;
+	debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
+			    &mci->fake_inject_ue);
 
-	d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
-				&mci->fake_inject_count);
-	if (!d)
-		goto nomem;
+	debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
+			   &mci->fake_inject_count);
 
-	d = debugfs_create_file("fake_inject", S_IWUSR, parent,
-				&mci->dev,
-				&debug_fake_inject_fops);
-	if (!d)
-		goto nomem;
+	debugfs_create_file("fake_inject", S_IWUSR, parent, &mci->dev,
+			    &debug_fake_inject_fops);
 
 	mci->debugfs = parent;
-	return 0;
-nomem:
-	edac_debugfs_remove_recursive(mci->debugfs);
-	return -ENOMEM;
 }
 
 /* Create a toplevel dir under EDAC's debugfs hierarchy */
diff --git a/drivers/edac/edac_module.h b/drivers/edac/edac_module.h
index dec88dcea036..bc63a6a9dd0a 100644
--- a/drivers/edac/edac_module.h
+++ b/drivers/edac/edac_module.h
@@ -71,7 +71,7 @@ extern void *edac_align_ptr(void **p, unsigned size, int n_elems);
 #ifdef CONFIG_EDAC_DEBUG
 int edac_debugfs_init(void);
 void edac_debugfs_exit(void);
-int edac_create_debugfs_nodes(struct mem_ctl_info *mci);
+void edac_create_debugfs_nodes(struct mem_ctl_info *mci);
 struct dentry *edac_debugfs_create_dir(const char *dirname);
 struct dentry *
 edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent);
@@ -85,7 +85,7 @@ edac_debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent, u
 #else
 static inline int edac_debugfs_init(void)					{ return -ENODEV; }
 static inline void edac_debugfs_exit(void)					{ }
-static inline int edac_create_debugfs_nodes(struct mem_ctl_info *mci)		{ return 0; }
+static inline void edac_create_debugfs_nodes(struct mem_ctl_info *mci)		{ }
 static inline struct dentry *edac_debugfs_create_dir(const char *dirname)	{ return NULL; }
 static inline struct dentry *
 edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)		{ return NULL; }
-- 
2.20.1

Re: [PATCH] edac: no need to check return value of debugfs_create functions

[Borislav Petkov]

On Tue, Jan 22, 2019 at 04:21:16PM +0100, Greg Kroah-Hartman wrote:
> When calling debugfs functions, there is no need to ever check the
> return value.  The function can work or not, but the code logic should
> never do something different based on this.
> 
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
> Cc: linux-edac@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/edac/debugfs.c     | 45 ++++++++++----------------------------
>  drivers/edac/edac_module.h |  4 ++--
>  2 files changed, 13 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/edac/debugfs.c b/drivers/edac/debugfs.c
> index 92dbb7e2320c..fd27ea0453a3 100644
> --- a/drivers/edac/debugfs.c
> +++ b/drivers/edac/debugfs.c
> @@ -44,10 +44,6 @@ static const struct file_operations debug_fake_inject_fops = {
>  int __init edac_debugfs_init(void)
>  {
>  	edac_debugfs = debugfs_create_dir("edac", NULL);
> -	if (IS_ERR(edac_debugfs)) {
> -		edac_debugfs = NULL;
> -		return -ENOMEM;
> -	}
>  	return 0;
>  }

Applied after making that function void too.

Thx.

-- 
Regards/Gruss,
    Boris.

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