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Date:   Fri, 2 Jun 2023 09:51:01 +0300
From:   Tony Lindgren <tony@atomide.com>
To:     Jiri Slaby <jirislaby@kernel.org>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@intel.com>,
        Dhruva Gole <d-gole@ti.com>,
        Ilpo =?utf-8?B?SsOkcnZpbmVu?= <ilpo.jarvinen@linux.intel.com>,
        John Ogness <john.ogness@linutronix.de>,
        Johan Hovold <johan@kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        linux-omap@vger.kernel.org, linux-serial@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] serial: core: Fix error handling for
 serial_core_ctrl_device_add()
Message-ID: <20230602065101.GG14287@atomide.com>
References: <20230602064104.41508-1-tony@atomide.com>
 <20230602064652.GF14287@atomide.com>
 <ca22d4ad-fd07-2733-a4c4-e6ed9c5ebe3f@kernel.org>
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* Jiri Slaby <jirislaby@kernel.org> [230602 06:48]:
> On 02. 06. 23, 8:46, Tony Lindgren wrote:
> > * Tony Lindgren <tony@atomide.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@atomide.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.
> 
> Why OR_NULL at all, actually?

Yup there should be no need for that thanks.

Regards,

Tony