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Jiri Slaby
9f90a4ddef
put_tty_driver() is an alias for tty_driver_kref_put(). There is no need for two exported identical functions, therefore switch all users of old put_tty_driver() to new tty_driver_kref_put() and remove the former for good. Cc: Richard Henderson <[email protected]> Cc: Ivan Kokshaysky <[email protected]> Cc: Matt Turner <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Jeff Dike <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Anton Ivanov <[email protected]> Cc: Chris Zankel <[email protected]> Cc: Max Filippov <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Samuel Iglesias Gonsalvez <[email protected]> Cc: Jens Taprogge <[email protected]> Cc: Karsten Keil <[email protected]> Cc: Scott Branden <[email protected]> Cc: Ulf Hansson <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Jakub Kicinski <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: David Lin <[email protected]> Cc: Johan Hovold <[email protected]> Cc: Alex Elder <[email protected]> Cc: Jiri Slaby <[email protected]> Cc: Laurentiu Tudor <[email protected]> Cc: Jiri Kosina <[email protected]> Cc: David Sterba <[email protected]> Cc: Shawn Guo <[email protected]> Cc: Sascha Hauer <[email protected]> Cc: Pengutronix Kernel Team <[email protected]> Cc: Fabio Estevam <[email protected]> Cc: NXP Linux Team <[email protected]> Cc: Oliver Neukum <[email protected]> Cc: Felipe Balbi <[email protected]> Cc: Mathias Nyman <[email protected]> Cc: Marcel Holtmann <[email protected]> Cc: Johan Hedberg <[email protected]> Cc: Luiz Augusto von Dentz <[email protected]> Acked-by: Alex Elder <[email protected]> Acked-by: Christian Borntraeger <[email protected]> Acked-by: Max Filippov <[email protected]> Acked-by: David Sterba <[email protected]> Acked-by: Samuel Iglesias Gonsálvez <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 Axis Communications AB
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*
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* Based on ttyprintk.c:
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* Copyright (C) 2010 Samo Pogacnik
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*/
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#include <linux/console.h>
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#include <linux/module.h>
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#include <linux/tty.h>
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static const struct tty_port_operations ttynull_port_ops;
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static struct tty_driver *ttynull_driver;
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static struct tty_port ttynull_port;
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static int ttynull_open(struct tty_struct *tty, struct file *filp)
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{
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return tty_port_open(&ttynull_port, tty, filp);
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}
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static void ttynull_close(struct tty_struct *tty, struct file *filp)
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{
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tty_port_close(&ttynull_port, tty, filp);
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}
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static void ttynull_hangup(struct tty_struct *tty)
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{
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tty_port_hangup(&ttynull_port);
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}
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static int ttynull_write(struct tty_struct *tty, const unsigned char *buf,
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int count)
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{
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return count;
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}
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static unsigned int ttynull_write_room(struct tty_struct *tty)
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{
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return 65536;
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}
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static const struct tty_operations ttynull_ops = {
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.open = ttynull_open,
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.close = ttynull_close,
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.hangup = ttynull_hangup,
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.write = ttynull_write,
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.write_room = ttynull_write_room,
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};
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static struct tty_driver *ttynull_device(struct console *c, int *index)
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{
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*index = 0;
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return ttynull_driver;
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}
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static struct console ttynull_console = {
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.name = "ttynull",
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.device = ttynull_device,
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};
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static int __init ttynull_init(void)
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{
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struct tty_driver *driver;
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int ret;
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driver = tty_alloc_driver(1,
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TTY_DRIVER_RESET_TERMIOS |
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TTY_DRIVER_REAL_RAW |
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TTY_DRIVER_UNNUMBERED_NODE);
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if (IS_ERR(driver))
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return PTR_ERR(driver);
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tty_port_init(&ttynull_port);
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ttynull_port.ops = &ttynull_port_ops;
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driver->driver_name = "ttynull";
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driver->name = "ttynull";
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driver->type = TTY_DRIVER_TYPE_CONSOLE;
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driver->init_termios = tty_std_termios;
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driver->init_termios.c_oflag = OPOST | OCRNL | ONOCR | ONLRET;
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tty_set_operations(driver, &ttynull_ops);
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tty_port_link_device(&ttynull_port, driver, 0);
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ret = tty_register_driver(driver);
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if (ret < 0) {
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tty_driver_kref_put(driver);
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tty_port_destroy(&ttynull_port);
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return ret;
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}
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ttynull_driver = driver;
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register_console(&ttynull_console);
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return 0;
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}
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static void __exit ttynull_exit(void)
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{
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unregister_console(&ttynull_console);
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tty_unregister_driver(ttynull_driver);
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tty_driver_kref_put(ttynull_driver);
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tty_port_destroy(&ttynull_port);
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}
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module_init(ttynull_init);
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module_exit(ttynull_exit);
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MODULE_LICENSE("GPL v2");
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