From: Johan Hovold <johan@kernel.org>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Johan Hovold <johan@kernel.org>,
Jacek Anaszewski <jacek.anaszewski@gmail.com>,
Pavel Machek <pavel@ucw.cz>, Dan Murphy <dmurphy@ti.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel@pengutronix.de, linux-serial@vger.kernel.org
Subject: Re: [PATCH v6 4/4] leds: trigger: implement a tty trigger
Date: Wed, 19 Feb 2020 13:48:59 +0100 [thread overview]
Message-ID: <20200219124859.GC32540@localhost> (raw)
In-Reply-To: <20200219111913.GB32540@localhost>
On Wed, Feb 19, 2020 at 12:19:13PM +0100, Johan Hovold wrote:
> On Wed, Feb 19, 2020 at 12:03:06PM +0100, Uwe Kleine-König wrote:
> > On Wed, Feb 19, 2020 at 11:52:39AM +0100, Johan Hovold wrote:
> > If I understand correctly calling tty_kopen_shared() doesn't open the
> > device, just keep it referenced which prevents it to disappear. Unless I
> > miss something it doesn't result in the tty's .open() being called.
>
> So tty_kopen_shared() is something you added. Judging from a quick look
> it seems you can only attach a trigger to an already open port, but the
> trigger will then keep the port open (again, consider modem control,
> power).
Sorry, my bad; this reference shouldn't prevent the port from being
closed.
The fact that you need the port to be open before you can attach a
trigger does sound like a problem though (e.g. consider udev rules).
Johan
next prev parent reply other threads:[~2020-02-19 12:49 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 9:15 [PATCH v6 0/4] leds: trigger: implement a tty trigger Uwe Kleine-König
2020-02-13 9:15 ` [PATCH v6 1/4] lib: new helper kstrtodev_t() Uwe Kleine-König
2020-02-19 19:50 ` Andy Shevchenko
2020-02-20 7:49 ` Uwe Kleine-König
2020-02-20 10:22 ` Andy Shevchenko
2020-02-20 10:57 ` Uwe Kleine-König
2020-02-20 11:46 ` Andy Shevchenko
2020-02-20 11:57 ` Andy Shevchenko
2020-02-20 14:01 ` Uwe Kleine-König
2020-02-21 8:42 ` Andy Shevchenko
2020-02-21 10:53 ` Uwe Kleine-König
2020-04-25 7:07 ` Pavel Machek
2020-02-13 9:15 ` [PATCH v6 2/4] tty: rename tty_kopen() and add new function tty_kopen_shared() Uwe Kleine-König
2020-02-19 13:21 ` Johan Hovold
2020-02-19 16:37 ` Uwe Kleine-König
2020-02-19 17:17 ` Johan Hovold
2020-02-20 11:04 ` Uwe Kleine-König
2020-02-25 8:55 ` Johan Hovold
2020-02-25 9:05 ` Uwe Kleine-König
2020-02-13 9:15 ` [PATCH v6 3/4] tty: new helper function tty_get_icount() Uwe Kleine-König
2020-02-13 9:16 ` [PATCH v6 4/4] leds: trigger: implement a tty trigger Uwe Kleine-König
2020-02-19 10:52 ` Johan Hovold
2020-02-19 11:03 ` Uwe Kleine-König
2020-02-19 11:19 ` Johan Hovold
2020-02-19 12:48 ` Johan Hovold [this message]
2020-02-19 10:40 ` [PATCH v6 0/4] " Greg Kroah-Hartman
2020-02-26 14:02 ` Pavel Machek
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