linux-kernel - Re: [PATCH] serial: core: Fix error handling for serial_core_ctrl_device

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Date:   Fri, 2 Jun 2023 09:46:52 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: core: Fix error handling for
 serial_core_ctrl_device_add()

* Tony Lindgren <tony@...mide.com> [230602 06:41]:
> Checking for NULL is not enough as serial_base_ctrl_add() uses ERR_PTR().
> 
> Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM")
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>  drivers/tty/serial/serial_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -3342,7 +3342,7 @@ int serial_core_register_port(struct uart_driver *drv, struct uart_port *port)
>  	ctrl_dev = serial_core_ctrl_find(drv, port->dev, port->ctrl_id);
>  	if (!ctrl_dev) {
>  		new_ctrl_dev = serial_core_ctrl_device_add(port);
> -		if (!new_ctrl_dev) {
> +		if (IS_ERR_OR_NULL(new_ctrl_dev)) {
>  			ret = -ENODEV;
>  			goto err_unlock;
>  		}

Hmm actually we should also change to use ret = PTR_ERR(new_ctrl_dev) here
instead of translating all the errors to -ENODEV. Will send out v2 version.

Regards,

Tony