linux-kernel - Re: [BUG] staging: rtl8192u: Found a bug when removing the module

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Message-ID: <CAA5qM4B5NAGH1ewpo_cAStYj8cD4bKpcTingQiaGcF2sCo9cKQ@mail.gmail.com>
Date:   Sun, 17 Jul 2022 00:01:51 -0700
From:   Tong Zhang <ztong0001@...il.com>
To:     Zheyu Ma <zheyuma97@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-staging@...ts.linux.dev,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] staging: rtl8192u: Found a bug when removing the module

On Sat, Jul 16, 2022 at 5:16 AM Zheyu Ma <zheyuma97@...il.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