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SubjectRe: [PATCH 2/2] debugfs: make return value of all debugfs helpers consistent

Hi Greg,

On Mon, Apr 15, 2019 at 10:48:44AM +0200, Greg Kroah-Hartman wrote:
> On Mon, Apr 15, 2019 at 01:25:06AM -0700, Ronald Tschalär wrote:
> > Since commit ff9fb72bc077 ("debugfs: return error values, not NULL")
> > almost all the debugfs helpers have stopped returning NULL. The lone
> > holdeout was debugfs_create_u32_array(). So fix that.
> >
> > Signed-off-by: Ronald Tschalär <ronald@innovation.ch>
> > ---
> > fs/debugfs/file.c | 6 +++---
> > 1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
> > index ddd708b09fa1..bb706d073782 100644
> > --- a/fs/debugfs/file.c
> > +++ b/fs/debugfs/file.c
> > @@ -999,8 +999,8 @@ static const struct file_operations u32_array_fops = {
> > * Once array is created its size can not be changed.
> > *
> > * 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.
> > + * %ERR_PTR(-ERROR) 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,
> > @@ -1009,7 +1009,7 @@ struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
> > struct array_data *data = kmalloc(sizeof(*data), GFP_KERNEL);
> >
> > if (data == NULL)
> > - return NULL;
> > + return ERR_PTR(-ENOMEM);
> >
> > data->array = array;
> > data->elements = elements;
>
> There is only one caller of this function in the kernel now, and it does
> not even care about the return value at all, so we should just remove
> the return value entirely as that's the easiest and best thing to do
> here.

Interesting argument: since this is a helper/library function, and
therefore potentially used in the future by others, it seems to me
that consistency with the other functions and providing error feedback
would be important.

> I was going to start doing this slowly over time, but as you are
> touching the function now, might as well do it here :)

Are you saying the plan is to make all these helpers return void?


Cheers,

Ronald

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