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authorPetr Mladek <pmladek@suse.com>2020-12-14 17:14:57 +0300
committerPetr Mladek <pmladek@suse.com>2020-12-14 17:14:57 +0300
commit5f3b8d398601055f29f32986a94d55955cd48f09 (patch)
tree9d1ccae747f39c27ecaff8e23f8e760d996ae2ee /drivers/tty
parentb031a684bfd01d633c79d281bd0cf11c2f834ada (diff)
parent3cffa06aeef7ece30f6b5ac0ea51f264e8fea4d0 (diff)
downloadlinux-5f3b8d398601055f29f32986a94d55955cd48f09.tar.xz
Merge branch 'for-5.11-null-console' into for-linus
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/Kconfig14
-rw-r--r--drivers/tty/Makefile3
-rw-r--r--drivers/tty/ttynull.c18
3 files changed, 19 insertions, 16 deletions
diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
index 93fd984eb2f5..ca359bbd62f5 100644
--- a/drivers/tty/Kconfig
+++ b/drivers/tty/Kconfig
@@ -428,20 +428,6 @@ config MIPS_EJTAG_FDC_KGDB_CHAN
help
FDC channel number to use for KGDB.
-config NULL_TTY
- tristate "NULL TTY driver"
- help
- Say Y here if you want a NULL TTY which simply discards messages.
-
- This is useful to allow userspace applications which expect a console
- device to work without modifications even when no console is
- available or desired.
-
- In order to use this driver, you should redirect the console to this
- TTY, or boot the kernel with console=ttynull.
-
- If unsure, say N.
-
config TRACE_ROUTER
tristate "Trace data router for MIPI P1149.7 cJTAG standard"
depends on TRACE_SINK
diff --git a/drivers/tty/Makefile b/drivers/tty/Makefile
index 020b1cd9294f..f6b6bee0422d 100644
--- a/drivers/tty/Makefile
+++ b/drivers/tty/Makefile
@@ -2,7 +2,7 @@
obj-$(CONFIG_TTY) += tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o \
tty_buffer.o tty_port.o tty_mutex.o \
tty_ldsem.o tty_baudrate.o tty_jobctrl.o \
- n_null.o
+ n_null.o ttynull.o
obj-$(CONFIG_LEGACY_PTYS) += pty.o
obj-$(CONFIG_UNIX98_PTYS) += pty.o
obj-$(CONFIG_AUDIT) += tty_audit.o
@@ -25,7 +25,6 @@ obj-$(CONFIG_ISI) += isicom.o
obj-$(CONFIG_MOXA_INTELLIO) += moxa.o
obj-$(CONFIG_MOXA_SMARTIO) += mxser.o
obj-$(CONFIG_NOZOMI) += nozomi.o
-obj-$(CONFIG_NULL_TTY) += ttynull.o
obj-$(CONFIG_ROCKETPORT) += rocket.o
obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o
obj-$(CONFIG_SYNCLINKMP) += synclinkmp.o
diff --git a/drivers/tty/ttynull.c b/drivers/tty/ttynull.c
index 17f05b7eb6d3..eced70ec54e1 100644
--- a/drivers/tty/ttynull.c
+++ b/drivers/tty/ttynull.c
@@ -2,6 +2,13 @@
/*
* Copyright (C) 2019 Axis Communications AB
*
+ * The console is useful for userspace applications which expect a console
+ * device to work without modifications even when no console is available
+ * or desired.
+ *
+ * In order to use this driver, you should redirect the console to this
+ * TTY, or boot the kernel with console=ttynull.
+ *
* Based on ttyprintk.c:
* Copyright (C) 2010 Samo Pogacnik
*/
@@ -59,6 +66,17 @@ static struct console ttynull_console = {
.device = ttynull_device,
};
+void __init register_ttynull_console(void)
+{
+ if (!ttynull_driver)
+ return;
+
+ if (add_preferred_console(ttynull_console.name, 0, NULL))
+ return;
+
+ register_console(&ttynull_console);
+}
+
static int __init ttynull_init(void)
{
struct tty_driver *driver;