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From: Tong Zhang <ztong0001@gmail.com>
Date: Sun, 17 Jul 2022 00:01:51 -0700
Message-ID: <CAA5qM4B5NAGH1ewpo_cAStYj8cD4bKpcTingQiaGcF2sCo9cKQ@mail.gmail.com>
Subject: Re: [BUG] staging: rtl8192u: Found a bug when removing the module
To: Zheyu Ma <zheyuma97@gmail.com>
Cc: Greg KH <gregkh@linuxfoundation.org>, Dan Carpenter <dan.carpenter@oracle.com>, 
	linux-staging@lists.linux.dev, 
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"

On Sat, Jul 16, 2022 at 5:16 AM Zheyu Ma <zheyuma97@gmail.com> wrote:
>
> Hello,
>
> I found a bug in the rtl8192u module.
>
> When removing the module, I got the following warning:
>
> [   20.407360] remove_proc_entry: removing non-empty directory
> 'net/rtl819xU', leaking at least 'wlan0'
> [   20.408609] WARNING: CPU: 4 PID: 451 at fs/proc/generic.c:718
> remove_proc_entry+0x2e1/0x3e0
> [   20.412316] RIP: 0010:remove_proc_entry+0x2e1/0x3e0
> [   20.420050] Call Trace:
> [   20.421178]  rtl8192_usb_module_exit+0x4a/0x63 [r8192u_usb]
>
> I think the problem is the misuse of the proc entry, but I'm not
> familiar with the driver, so I'm reporting the bug to you.
>
> regards,
>
> Zheyu Ma

Thanks for reporting. Looks like wlan0 is renamed to something else
later after proc fs files are created.
Could you test the following patch?
Thanks!
- Tong