linux-kernel - [PATCH] debugfs: make debugfs_create_u32

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Date:   Tue, 16 Apr 2019 15:46:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Life is hard, and then you die" <ronald@...ovation.ch>
Cc:     Jonathan Corbet <corbet@....net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] debugfs: make debugfs_create_u32_array() return void

The single user of debugfs_create_u32_array() does not care about the
return value of it, so make it return void as there is no need to do
anything with the return value.

Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 Documentation/filesystems/debugfs.txt |  2 +-
 fs/debugfs/file.c                     | 13 ++++---------
 include/linux/debugfs.h               | 12 +++++-------
 3 files changed, 10 insertions(+), 17 deletions(-)

diff --git a/Documentation/filesystems/debugfs.txt b/Documentation/filesystems/debugfs.txt
index 4f45f71149cb..6320e86d2294 100644
--- a/Documentation/filesystems/debugfs.txt
+++ b/Documentation/filesystems/debugfs.txt
@@ -168,7 +168,7 @@ byte offsets over a base for the register block.
 
 If you want to dump an u32 array in debugfs, you can create file with:
 
-    struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
+    void debugfs_create_u32_array(const char *name, umode_t mode,
 			struct dentry *parent,
 			u32 *array, u32 elements);
 
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 4fce1da7db23..2c17039c6287 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -1004,24 +1004,19 @@ static const struct file_operations u32_array_fops = {
  * @array as data. If the @mode variable is so set it can be read from.
  * Writing is not supported. Seek within the file is also not supported.
  * Once array is created its size can not be changed.
- *
- * The function returns a pointer to dentry on success. If debugfs is not
- * enabled in the kernel, the value -%ENODEV will be returned.
  */
-struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
-					    struct dentry *parent,
-					    u32 *array, u32 elements)
+void debugfs_create_u32_array(const char *name, umode_t mode,
+			      struct dentry *parent, u32 *array, u32 elements)
 {
 	struct array_data *data = kmalloc(sizeof(*data), GFP_KERNEL);
 
 	if (data == NULL)
-		return NULL;
+		return;
 
 	data->array = array;
 	data->elements = elements;
 
-	return debugfs_create_file_unsafe(name, mode, parent, data,
-					&u32_array_fops);
+	debugfs_create_file_unsafe(name, mode, parent, data, &u32_array_fops);
 }
 EXPORT_SYMBOL_GPL(debugfs_create_u32_array);
 
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 3b0ba54cc4d5..58424eb3b329 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -133,9 +133,8 @@ struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
 void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
 			  int nregs, void __iomem *base, char *prefix);
 
-struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
-					struct dentry *parent,
-					u32 *array, u32 elements);
+void debugfs_create_u32_array(const char *name, umode_t mode,
+			      struct dentry *parent, u32 *array, u32 elements);
 
 struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name,
 					   struct dentry *parent,
@@ -353,11 +352,10 @@ static inline bool debugfs_initialized(void)
 	return false;
 }
 
-static inline struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
-					struct dentry *parent,
-					u32 *array, u32 elements)
+static inline void debugfs_create_u32_array(const char *name, umode_t mode,
+					    struct dentry *parent, u32 *array,
+					    u32 elements)
 {
-	return ERR_PTR(-ENODEV);
 }
 
 static inline struct dentry *debugfs_create_devm_seqfile(struct device *dev,
-- 
2.21.0