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debugfs: update documented return values of debugfs helpers

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Since commit ff9fb72bc0 ("debugfs: return error values, not NULL")
these helper functions do not return NULL anymore (with the exception
of debugfs_create_u32_array()).

Fixes: ff9fb72bc0 ("debugfs: return error values, not NULL")
Signed-off-by: Ronald Tschalär <ronald@innovation.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ronald Tschalär 2019-04-15 01:25:05 -07:00 committed by Greg Kroah-Hartman
parent 5de363b66a
commit 9abb24990a
2 changed files with 44 additions and 49 deletions
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16
Documentation/filesystems/debugfs.txt
View File

@ -31,10 +31,10 @@ This call, if successful, will make a directory called name underneath the
indicated parent directory. If parent is NULL, the directory will be
created in the debugfs root. On success, the return value is a struct
dentry pointer which can be used to create files in the directory (and to
clean it up at the end). A NULL return value indicates that something went
wrong. If ERR_PTR(-ENODEV) is returned, that is an indication that the
kernel has been built without debugfs support and none of the functions
described below will work.
clean it up at the end). An ERR_PTR(-ERROR) return value indicates that
something went wrong. If ERR_PTR(-ENODEV) is returned, that is an
indication that the kernel has been built without debugfs support and none
of the functions described below will work.
The most general way to create a file within a debugfs directory is with:
@ -48,8 +48,9 @@ should hold the file, data will be stored in the i_private field of the
resulting inode structure, and fops is a set of file operations which
implement the file's behavior. At a minimum, the read() and/or write()
operations should be provided; others can be included as needed. Again,
the return value will be a dentry pointer to the created file, NULL for
error, or ERR_PTR(-ENODEV) if debugfs support is missing.
the return value will be a dentry pointer to the created file,
ERR_PTR(-ERROR) on error, or ERR_PTR(-ENODEV) if debugfs support is
missing.
Create a file with an initial size, the following function can be used
instead:
@ -214,7 +215,8 @@ can be removed with:
void debugfs_remove(struct dentry *dentry);
The dentry value can be NULL, in which case nothing will be removed.
The dentry value can be NULL or an error value, in which case nothing will
be removed.
Once upon a time, debugfs users were required to remember the dentry
pointer for every debugfs file they created so that all files could be

77
fs/debugfs/file.c
View File

@ -394,12 +394,11 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_wo, NULL, debugfs_u8_set, "%llu\n");
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
* you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be
* returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
* code.
* If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will
* be returned.
*/
struct dentry *debugfs_create_u8(const char *name, umode_t mode,
struct dentry *parent, u8 *value)
@ -440,12 +439,11 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_wo, NULL, debugfs_u16_set, "%llu\n");
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
* you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be
* returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
* code.
* If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will
* be returned.
*/
struct dentry *debugfs_create_u16(const char *name, umode_t mode,
struct dentry *parent, u16 *value)
@ -486,12 +484,11 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_wo, NULL, debugfs_u32_set, "%llu\n");
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
* you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be
* returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
* code.
* If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will
* be returned.
*/
struct dentry *debugfs_create_u32(const char *name, umode_t mode,
struct dentry *parent, u32 *value)
@ -533,12 +530,11 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_wo, NULL, debugfs_u64_set, "%llu\n");
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
* you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be
* returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
* code.
* If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will
* be returned.
*/
struct dentry *debugfs_create_u64(const char *name, umode_t mode,
struct dentry *parent, u64 *value)
@ -582,12 +578,11 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_wo, NULL, debugfs_ulong_set, "%llu\n");
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
* you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be
* returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
* code.
* If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will
* be returned.
*/
struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
struct dentry *parent, unsigned long *value)
@ -850,12 +845,11 @@ static const struct file_operations fops_bool_wo = {
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
* you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be
* returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
* code.
* If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will
* be returned.
*/
struct dentry *debugfs_create_bool(const char *name, umode_t mode,
struct dentry *parent, bool *value)
@ -904,12 +898,11 @@ static const struct file_operations fops_blob = {
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
* you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be
* returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
* code.
* If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will
* be returned.
*/
struct dentry *debugfs_create_blob(const char *name, umode_t mode,
struct dentry *parent,
@ -1005,8 +998,9 @@ static const struct file_operations u32_array_fops = {
* 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.
* The function returns a pointer to dentry on success. If an error occurs,
* %ERR_PTR(-ERROR) or NULL will be returned. If debugfs is not enabled in
* the kernel, the value %ERR_PTR(-ENODEV) will be returned.
*/
struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
struct dentry *parent,
@ -1102,12 +1096,11 @@ static const struct file_operations fops_regset32 = {
* This function will return a pointer to a dentry if it succeeds. This
* pointer must be passed to the debugfs_remove() function when the file is
* to be removed (no automatic cleanup happens if your module is unloaded,
* you are responsible here.) If an error occurs, %NULL will be returned.
* you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be
* returned.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned. It is not wise to check for this value, but rather, check for
* %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
* code.
* If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will
* be returned.
*/
struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
struct dentry *parent,