linux-kernel - Re: [PATCH v2 1/3] tty: new helper function tty_kopen

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Date:   Tue, 17 Dec 2019 12:05:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-serial@...r.kernel.org,
        kernel@...gutronix.de
Subject: Re: [PATCH v2 1/3] tty: new helper function tty_kopen_shared

On Tue, Dec 17, 2019 at 11:51:01AM +0100, Uwe Kleine-König wrote:
> Hello Greg,
> 
> all feedback I don't respond to is planned to be fixed in v3.
> 
> On Tue, Dec 17, 2019 at 09:27:33AM +0100, Greg Kroah-Hartman wrote:
> > On Tue, Dec 17, 2019 at 09:17:16AM +0100, Uwe Kleine-König wrote:
> > > +struct tty_struct *tty_kopen_shared(dev_t device)
> > > +{
> > > +	struct tty_struct *tty;
> > > +	struct tty_driver *driver;
> > > +	int index = -1;
> > > +
> > > +	mutex_lock(&tty_mutex);
> > > +	driver = tty_lookup_driver(device, NULL, &index);
> > > +	if (IS_ERR(driver)) {
> > > +		tty = ERR_CAST(driver);
> > > +		goto err_lookup_driver;
> > > +	}
> > > +
> > > +	tty = tty_driver_lookup_tty(driver, NULL, index);
> > 
> > No error check?
> 
> Well, the caller of tty_kopen_shared is supposed to check for error
> returns. Do you think an error message here would be approriate? I'd do
> this in the caller similar to how tty_kopen works.

Ah, you are passing it on to the caller, ok, nevermind.

greg k-h