diff options
| -rw-r--r-- | drivers/tty/n_tty.c | 34 |
1 files changed, 2 insertions, 32 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 827206914b02..d04f398d5de3 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -113,8 +113,6 @@ struct n_tty_data { DECLARE_BITMAP(read_flags, N_TTY_BUF_SIZE); unsigned char echo_buf[N_TTY_BUF_SIZE]; - int minimum_to_wake; - /* consumer-published */ size_t read_tail; size_t line_start; @@ -1633,7 +1631,7 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp, /* publish read_head to consumer */ smp_store_release(&ldata->commit_head, ldata->read_head); - if ((read_cnt(ldata) >= ldata->minimum_to_wake) || L_EXTPROC(tty)) { + if (read_cnt(ldata)) { kill_fasync(&tty->fasync, SIGIO, POLL_IN); wake_up_interruptible_poll(&tty->read_wait, POLLIN); } @@ -1900,7 +1898,6 @@ static int n_tty_open(struct tty_struct *tty) 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; @@ -2163,14 +2160,9 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file, minimum = MIN_CHAR(tty); if (minimum) { time = (HZ / 10) * TIME_CHAR(tty); - if (time) - ldata->minimum_to_wake = 1; - else if (!waitqueue_active(&tty->read_wait) || - (ldata->minimum_to_wake > minimum)) - ldata->minimum_to_wake = minimum; } else { timeout = (HZ / 10) * TIME_CHAR(tty); - ldata->minimum_to_wake = minimum = 1; + minimum = 1; } } @@ -2197,10 +2189,6 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file, break; } - if (((minimum - (b - buf)) < ldata->minimum_to_wake) && - ((minimum - (b - buf)) >= 1)) - ldata->minimum_to_wake = (minimum - (b - buf)); - done = check_other_done(tty); if (!input_available_p(tty, 0)) { @@ -2266,9 +2254,6 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file, up_read(&tty->termios_rwsem); remove_wait_queue(&tty->read_wait, &wait); - if (!waitqueue_active(&tty->read_wait)) - ldata->minimum_to_wake = minimum; - mutex_unlock(&ldata->atomic_read_lock); if (b - buf) @@ -2403,7 +2388,6 @@ break_out: static unsigned int n_tty_poll(struct tty_struct *tty, struct file *file, poll_table *wait) { - struct n_tty_data *ldata = tty->disc_data; unsigned int mask = 0; poll_wait(file, &tty->read_wait, wait); @@ -2416,12 +2400,6 @@ static unsigned int n_tty_poll(struct tty_struct *tty, struct file *file, mask |= POLLPRI | POLLIN | POLLRDNORM; if (tty_hung_up_p(file)) mask |= POLLHUP; - if (!(mask & (POLLHUP | POLLIN | POLLRDNORM))) { - if (MIN_CHAR(tty) && !TIME_CHAR(tty)) - ldata->minimum_to_wake = MIN_CHAR(tty); - else - ldata->minimum_to_wake = 1; - } if (tty->ops->write && !tty_is_writelocked(tty) && tty_chars_in_buffer(tty) < WAKEUP_CHARS && tty_write_room(tty) > 0) @@ -2472,14 +2450,6 @@ static int n_tty_ioctl(struct tty_struct *tty, struct file *file, static void n_tty_fasync(struct tty_struct *tty, int on) { - struct n_tty_data *ldata = tty->disc_data; - - if (!waitqueue_active(&tty->read_wait)) { - if (on) - ldata->minimum_to_wake = 1; - else if (!tty->fasync) - ldata->minimum_to_wake = N_TTY_BUF_SIZE; - } } static struct tty_ldisc_ops n_tty_ops = { |