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| author | Rodolfo Giometti <giometti@linux.it> | 2010-03-10 15:23:46 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-12 15:52:43 -0800 |
| commit | 572b9adbd40b5565dc413db04af9cc234f72bf19 (patch) | |
| tree | 038e00dc5f3b5b1e8835b083df7dccabb2cfd88f | |
| parent | b3e63afe8a74c0134d05a551cc74facc3b3ec0d7 (diff) | |
| download | lwn-572b9adbd40b5565dc413db04af9cc234f72bf19.tar.gz lwn-572b9adbd40b5565dc413db04af9cc234f72bf19.zip | |
ldisc n_tty: add new method n_tty_inherit_ops()
This new method can be used to init a new struct tty_ldisc_ops as the
default tty_ldisc_N_TTY struct.
Signed-off-by: Rodolfo Giometti <giometti@linux.it>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Greg KH <greg@kroah.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/char/n_tty.c | 17 | ||||
| -rw-r--r-- | include/linux/tty.h | 1 |
2 files changed, 18 insertions, 0 deletions
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c index 2e50f4dfc79c..bdae8327143c 100644 --- a/drivers/char/n_tty.c +++ b/drivers/char/n_tty.c @@ -48,6 +48,7 @@ #include <linux/audit.h> #include <linux/file.h> #include <linux/uaccess.h> +#include <linux/module.h> #include <asm/system.h> @@ -2091,3 +2092,19 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = { .receive_buf = n_tty_receive_buf, .write_wakeup = n_tty_write_wakeup }; + +/** + * n_tty_inherit_ops - inherit N_TTY methods + * @ops: struct tty_ldisc_ops where to save N_TTY methods + * + * Used by a generic struct tty_ldisc_ops to easily inherit N_TTY + * methods. + */ + +void n_tty_inherit_ops(struct tty_ldisc_ops *ops) +{ + *ops = tty_ldisc_N_TTY; + ops->owner = NULL; + ops->refcount = ops->flags = 0; +} +EXPORT_SYMBOL_GPL(n_tty_inherit_ops); diff --git a/include/linux/tty.h b/include/linux/tty.h index d96e5882f129..568369a86306 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -514,6 +514,7 @@ extern void tty_ldisc_enable(struct tty_struct *tty); /* n_tty.c */ extern struct tty_ldisc_ops tty_ldisc_N_TTY; +extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops); /* tty_audit.c */ #ifdef CONFIG_AUDIT |