diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2013-06-15 18:21:19 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-24 04:08:40 +0400 |
| commit | 20bafb3d23d108bc0a896eb8b7c1501f4f649b77 (patch) | |
| tree | 0bf413c30569ea07cae3882e50b897a084b89d62 /drivers/tty/n_tty.c | |
| parent | 8cb06c983822103da1cfe57b9901e60a00e61f67 (diff) | |
| download | linux-20bafb3d23d108bc0a896eb8b7c1501f4f649b77.tar.xz | |
n_tty: Move buffers into n_tty_data
Reduce pointer reloading and improve locality-of-reference;
allocate read_buf and echo_buf within struct n_tty_data.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/n_tty.c')
| -rw-r--r-- | drivers/tty/n_tty.c | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index d6eba99785c4..51cbdd22c18c 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -105,9 +105,9 @@ struct n_tty_data { unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1; /* shared by producer and consumer */ - char *read_buf; + char read_buf[N_TTY_BUF_SIZE]; DECLARE_BITMAP(read_flags, N_TTY_BUF_SIZE); - unsigned char *echo_buf; + unsigned char echo_buf[N_TTY_BUF_SIZE]; int minimum_to_wake; @@ -1695,9 +1695,7 @@ static void n_tty_close(struct tty_struct *tty) if (tty->link) n_tty_packet_mode_flush(tty); - kfree(ldata->read_buf); - kfree(ldata->echo_buf); - kfree(ldata); + vfree(ldata); tty->disc_data = NULL; } @@ -1715,7 +1713,8 @@ static int n_tty_open(struct tty_struct *tty) { struct n_tty_data *ldata; - ldata = kzalloc(sizeof(*ldata), GFP_KERNEL); + /* Currently a malloc failure here can panic */ + ldata = vmalloc(sizeof(*ldata)); if (!ldata) goto err; @@ -1723,16 +1722,14 @@ static int n_tty_open(struct tty_struct *tty) mutex_init(&ldata->atomic_read_lock); mutex_init(&ldata->output_lock); - /* These are ugly. Currently a malloc failure here can panic */ - ldata->read_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL); - ldata->echo_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL); - if (!ldata->read_buf || !ldata->echo_buf) - goto err_free_bufs; - tty->disc_data = ldata; reset_buffer_flags(tty->disc_data); ldata->column = 0; + ldata->canon_column = 0; ldata->minimum_to_wake = 1; + ldata->num_overrun = 0; + ldata->no_room = 0; + ldata->lnext = 0; tty->closing = 0; /* indicate buffer work may resume */ clear_bit(TTY_LDISC_HALTED, &tty->flags); @@ -1740,10 +1737,6 @@ static int n_tty_open(struct tty_struct *tty) tty_unthrottle(tty); return 0; -err_free_bufs: - kfree(ldata->read_buf); - kfree(ldata->echo_buf); - kfree(ldata); err: return -ENOMEM; } |