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Message-ID: <CADyDSO6nY2=UONuHk0PMszWJ_Hnpg6h-VYX40xGtU2CnhTcy+w@mail.gmail.com>
Date: Wed, 31 May 2023 08:35:18 +0200
From: David Rheinsberg <david.rheinsberg@...il.com>
To: Osama Muhammad <osmtendev@...il.com>
Cc: jikos@...nel.org, benjamin.tissoires@...hat.com,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hid-wiimote-debug.c: Drop error checking for debugfs_create_file
Hi
On Tue, 30 May 2023 at 17:43, Osama Muhammad <osmtendev@...il.com> wrote:
>
> This patch removes the error checking for debugfs_create_file
> in hid-wiimote-debug.c.c. This is because the debugfs_create_file()
> does not return NULL but an ERR_PTR after an error.
> The DebugFS kernel API is developed in a way that the
> caller can safely ignore the errors that occur during
> the creation of DebugFS nodes.The debugfs Api handles
> it gracefully. The check is unnecessary.
>
> Link to the comment above debugfs_create_file:
> https://elixir.bootlin.com/linux/latest/source/fs/debugfs/inode.c#L451
>
> Signed-off-by: Osama Muhammad <osmtendev@...il.com>
Looks good, thanks!
Reviewed-by: David Rheinsberg <david@...dahead.eu>
Thanks
David
> ---
> changes since v1
> -In v1 the IS_ERR was used for error checking which is dropped now.
> ---
> drivers/hid/hid-wiimote-debug.c | 10 ----------
> 1 file changed, 10 deletions(-)
>
> diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
> index a99dcca2e099..00f9be55f148 100644
> --- a/drivers/hid/hid-wiimote-debug.c
> +++ b/drivers/hid/hid-wiimote-debug.c
> @@ -173,7 +173,6 @@ int wiidebug_init(struct wiimote_data *wdata)
> {
> struct wiimote_debug *dbg;
> unsigned long flags;
> - int ret = -ENOMEM;
>
> dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
> if (!dbg)
> @@ -183,13 +182,9 @@ 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)
> - goto err;
>
> dbg->drm = debugfs_create_file("drm", S_IRUSR,
> dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
> - if (!dbg->drm)
> - goto err_drm;
>
> spin_lock_irqsave(&wdata->state.lock, flags);
> wdata->debug = dbg;
> @@ -197,11 +192,6 @@ int wiidebug_init(struct wiimote_data *wdata)
>
> return 0;
>
> -err_drm:
> - debugfs_remove(dbg->eeprom);
> -err:
> - kfree(dbg);
> - return ret;
> }
>
> void wiidebug_deinit(struct wiimote_data *wdata)
> --
> 2.34.1
>
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