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TTY: n_tty, add ldisc data to n_tty

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All n_tty related members from tty_struct will be moved here.

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 2012-10-18 22:26:38 +02:00 committed by Greg Kroah-Hartman
parent 6c633f27cc
commit 70ece7a731
1 changed files with 18 additions and 1 deletions
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19
drivers/tty/n_tty.c
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@ -73,6 +73,10 @@
#define ECHO_OP_SET_CANON_COL 0x81
#define ECHO_OP_ERASE_TAB 0x82
struct n_tty_data {
char dummy;
};
static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
unsigned char __user *ptr)
{
@ -1556,11 +1560,15 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
static void n_tty_close(struct tty_struct *tty)
{
struct n_tty_data *ldata = tty->disc_data;
n_tty_flush_buffer(tty);
kfree(tty->read_buf);
kfree(tty->echo_buf);
kfree(ldata);
tty->read_buf = NULL;
tty->echo_buf = NULL;
tty->disc_data = NULL;
}
/**
@ -1575,23 +1583,32 @@ static void n_tty_close(struct tty_struct *tty)
static int n_tty_open(struct tty_struct *tty)
{
struct n_tty_data *ldata;
ldata = kzalloc(sizeof(*ldata), GFP_KERNEL);
if (!ldata)
goto err;
/* These are ugly. Currently a malloc failure here can panic */
tty->read_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
tty->echo_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
if (!tty->read_buf || !tty->echo_buf)
goto err_free_bufs;
tty->disc_data = ldata;
reset_buffer_flags(tty);
tty_unthrottle(tty);
tty->column = 0;
n_tty_set_termios(tty, NULL);
tty->minimum_to_wake = 1;
tty->closing = 0;
return 0;
err_free_bufs:
kfree(tty->read_buf);
kfree(tty->echo_buf);
kfree(ldata);
err:
return -ENOMEM;
}