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TTY: add support for unnumbered device nodes

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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>
This commit is contained in:
Jiri Slaby 2012-08-08 22:26:43 +02:00 • committed by Greg Kroah-Hartman
parent 16a02081ba
commit 0019b4089c
3 changed files with 15 additions and 15 deletions
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6
include/linux/tty_driver.h
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@ -394,6 +394,11 @@ static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
* 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 @@ static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
#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