linux-kernel - Re: [PATCH] USB: serial: ftdi_sio: Add check for create_sysfs

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Date:   Fri, 2 Sep 2022 07:24:38 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     johan@...nel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: serial: ftdi_sio: Add check for create_sysfs_attrs

On Fri, Sep 02, 2022 at 11:20:02AM +0800, Jiasheng Jiang wrote:
> As create_sysfs_attrs() can return error number,
> it should be better to check the return value and
> deal with the exception.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/usb/serial/ftdi_sio.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
> index d5a3986dfee7..c28f894430a5 100644
> --- a/drivers/usb/serial/ftdi_sio.c
> +++ b/drivers/usb/serial/ftdi_sio.c
> @@ -2251,7 +2251,11 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port)
>  	if (read_latency_timer(port) < 0)
>  		priv->latency = 16;
>  	write_latency_timer(port);
> -	create_sysfs_attrs(port);
> +	result = create_sysfs_attrs(port);
> +	if (result) {
> +		remove_sysfs_attrs(port);
> +		return result;
> +	}

Again, this should be changed to use a default attribute group instead.
Please make that change.

thanks,

greg k-h