linux-kernel - Re: [PATCH] staging: rtl8192u: cleanup proc fs entries upon exit

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Date:   Mon, 21 Feb 2022 18:16:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tong Zhang <ztong0001@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, Lee Jones <lee.jones@...aro.org>,
        Colin Ian King <colin.i.king@...glemail.com>,
        Saurav Girepunje <saurav.girepunje@...il.com>,
        Johan Hovold <johan@...nel.org>,
        Cláudio Maia <clrrm@...p.ipp.pt>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8192u: cleanup proc fs entries upon exit

On Sun, Feb 20, 2022 at 03:15:53PM -0800, Tong Zhang wrote:
> proc fs entries need to be removed when module is removed, otherwise
> when we try to insert the module again, kernel will complain
> 
> [  493.068012] proc_dir_entry 'net/ieee80211' already registered
> [  493.271973]  proc_mkdir+0x18/0x20
> [  493.272136]  ieee80211_debug_init+0x28/0xde8 [r8192u_usb]
> [  493.272404]  rtl8192_usb_module_init+0x10/0x161 [r8192u_usb]
> 
> [   13.910616] proc_dir_entry 'net/rtl819xU' already registered
> [   13.918931]  proc_mkdir+0x18/0x20
> [   13.919098]  rtl8192_usb_module_init+0x142/0x16d [r8192u_usb]
> 
> Signed-off-by: Tong Zhang <ztong0001@...il.com>
> ---
>  drivers/staging/rtl8192u/r8192U_core.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
> index 364e1ca94f70..683afdc667bc 100644
> --- a/drivers/staging/rtl8192u/r8192U_core.c
> +++ b/drivers/staging/rtl8192u/r8192U_core.c
> @@ -4825,6 +4825,11 @@ static int __init rtl8192_usb_module_init(void)
>  static void __exit rtl8192_usb_module_exit(void)
>  {
>  	usb_deregister(&rtl8192_usb_driver);
> +	remove_proc_entry(RTL819XU_MODULE_NAME, init_net.proc_net);
> +
> +#ifdef CONFIG_IEEE80211_DEBUG
> +	ieee80211_debug_exit();
> +#endif

Please do not put #ifdef in .c files.  They should be in a .h file
instead.

thanks,

greg k-h