linux-kernel - Re: [PATCH] hid-wiimote-debug.c: Fix error checking for debugfs_create

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Message-ID: <CAK6rUAOXShUhmdyKv6EM+moeBKiruoQgbqHxQNm9_20WcOW7=w@mail.gmail.com>
Date:   Tue, 30 May 2023 16:04:14 +0500
From:   Osama Muhammad <osmtendev@...il.com>
To:     David Rheinsberg <david.rheinsberg@...il.com>
Cc:     benjamin.tissoires@...hat.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hid-wiimote-debug.c: Fix error checking for debugfs_create_file

Hi,

I will adjust it by sending the revision of the patch by removing NULL-check.

Thanks,
Osmten

On Tue, 30 May 2023 at 15:48, David Rheinsberg
<david.rheinsberg@...il.com> wrote:
>
> Hi
>
> On Tue, 23 May 2023 at 19:13, Osama Muhammad <osmtendev@...il.com> wrote:
> >
> > This patch fixes the error checking in hid-wiimote-debug.c in
> > debugfs_create_file. The correct way to check if an error occurred
> > is 'IS_ERR' inline function.
>
> Please have a look at fs/debugfs/inode.c, especiall the docs of
> debugfs_create_file():
>
> 477  * NOTE: it's expected that most callers should _ignore_ the errors returned
> 478  * by this function. Other debugfs functions handle the fact that
> the "dentry"
> 479  * passed to them could be an error and they don't crash in that case.
> 480  * Drivers should generally work fine even if debugfs fails to init anyway.
>
> I think the current code is fine. If you feel like adjusting it, I
> would rather just remove the NULL-check.
>
> Thanks
> David
>
> > Signed-off-by: Osama Muhammad <osmtendev@...il.com>
> > ---
> >  drivers/hid/hid-wiimote-debug.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
> > index a99dcca2e099..eddd981fee1a 100644
> > --- a/drivers/hid/hid-wiimote-debug.c
> > +++ b/drivers/hid/hid-wiimote-debug.c
> > @@ -183,12 +183,12 @@ int wiidebug_init(struct wiimote_data *wdata)
> >
> >         dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
> >                 dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
> > -       if (!dbg->eeprom)
> > +       if (IS_ERR(dbg->eeprom))
> >                 goto err;
> >
> >         dbg->drm = debugfs_create_file("drm", S_IRUSR,
> >                         dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
> > -       if (!dbg->drm)
> > +       if (IS_ERR(dbg->drm))
> >                 goto err_drm;
> >
> >         spin_lock_irqsave(&wdata->state.lock, flags);
> > --
> > 2.34.1
> >