Commit 7ea4aa70 authored by Vincent Whitchurch's avatar Vincent Whitchurch Committed by Greg Kroah-Hartman
Browse files

char: ttyprintk: register console 



Register a console in the ttyprintk driver so that it can be selected
for /dev/console with console=ttyprintk on the kernel command line,
similar to other console drivers.

Signed-off-by: default avatarVincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20220215141750.92808-1-vincent.whitchurch@axis.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8f3631f0

drivers/char/Kconfig

+2 −1
Original line number Diff line number Diff line
@@ -18,7 +18,8 @@ config TTY_PRINTK 
	  The feature is useful to inline user messages with kernel

	  messages.

	  In order to use this feature, you should output user messages

	  to /dev/ttyprintk or redirect console to this TTY.

	  to /dev/ttyprintk or redirect console to this TTY, or boot

	  the kernel with console=ttyprintk.



	  If unsure, say N.

drivers/char/ttyprintk.c

+16 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
 * of the boot process, for example.

 */



#include <linux/console.h>

#include <linux/device.h>

#include <linux/serial.h>

#include <linux/tty.h>
@@ -163,6 +164,18 @@ static const struct tty_port_operations tpk_port_ops = { 


static struct tty_driver *ttyprintk_driver;



static struct tty_driver *ttyprintk_console_device(struct console *c,

						   int *index)

{

	*index = 0;

	return ttyprintk_driver;

}



static struct console ttyprintk_console = {

	.name = "ttyprintk",

	.device = ttyprintk_console_device,

};



static int __init ttyprintk_init(void)

{

	int ret;
@@ -195,6 +208,8 @@ static int __init ttyprintk_init(void) 
		goto error;

	}



	register_console(&ttyprintk_console);



	return 0;



error:
@@ -205,6 +220,7 @@ static int __init ttyprintk_init(void) 


static void __exit ttyprintk_exit(void)

{

	unregister_console(&ttyprintk_console);

	tty_unregister_driver(ttyprintk_driver);

	tty_driver_kref_put(ttyprintk_driver);

	tty_port_destroy(&tpk_port.port);