TTY: add support for unnumbered device nodes
This allows drivers like ttyprintk to avoid hacks to create an
unnumbered node in /dev. It used to set TTY_DRIVER_DYNAMIC_DEV in
flags and call device_create on its own. That is incorrect, because
TTY_DRIVER_DYNAMIC_DEV may be set only if tty_register_device is
called explicitly.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 1a85f00..44e05b7 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -394,6 +394,11 @@
* TTY_DRIVER_DYNAMIC_ALLOC -- do not allocate structures which are
* needed per line for this driver as it would waste memory.
* The driver will take care.
+ *
+ * TTY_DRIVER_UNNUMBERED_NODE -- do not create numbered /dev nodes. In
+ * other words create /dev/ttyprintk and not /dev/ttyprintk0.
+ * Applicable only when a driver for a single tty device is
+ * being allocated.
*/
#define TTY_DRIVER_INSTALLED 0x0001
#define TTY_DRIVER_RESET_TERMIOS 0x0002
@@ -402,6 +407,7 @@
#define TTY_DRIVER_DEVPTS_MEM 0x0010
#define TTY_DRIVER_HARDWARE_BREAK 0x0020
#define TTY_DRIVER_DYNAMIC_ALLOC 0x0040
+#define TTY_DRIVER_UNNUMBERED_NODE 0x0080
/* tty driver types */
#define TTY_DRIVER_TYPE_SYSTEM 0x0001