diff options
Diffstat (limited to 'drivers/tty/n_tty.c')
| -rw-r--r-- | drivers/tty/n_tty.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 3ebab0cfceb..3d1594e10d0 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -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; } |