linux-kernel - Re: [PATCH] tools/gpio: prevent resource leak

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Message-ID: <ZUzSM37FWz6sgH9n@rigel>
Date:   Thu, 9 Nov 2023 20:36:03 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     heminhong <heminhong@...inos.cn>
Cc:     linus.walleij@...aro.org, brgl@...ev.pl, andy@...nel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/gpio: prevent resource leak

On Thu, Nov 09, 2023 at 04:54:19PM +0800, heminhong wrote:
> In the main() function, the open() function is used to open the file.
> When the file is successfully opened, fd is used to interact with the file,
> but the fd is not closed, it will cause resource leak.
>

All open files are automatically closed when a process exits.
That includes both those returned by open() and by the GPIO ioctls.
So explicitly closing them here before exiting is redundant.

Cheers,
Kent.