diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2015-10-14 07:52:27 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-17 21:18:30 -0700 |
| commit | b3868e20f4ce21bb83c7a81bc50664d6a63596a8 (patch) | |
| tree | 560a38335bd092633037b170ffa02ee98ca57780 /drivers/tty | |
| parent | 4bd0162264da0d71df7e37a12a544459ba7ddcde (diff) | |
| download | linux-b3868e20f4ce21bb83c7a81bc50664d6a63596a8.tar.bz2 | |
n_tty: Remove reader wakeups for TTY_BREAK/TTY_PARITY chars
Waking the reader immediately upon receipt of TTY_BREAK or TTY_PARITY
chars has no effect on the outcome of read():
1. Only non-canonical/EXTPROC mode applies since canonical mode
will not return data until a line termination is received anyway
2. EXTPROC mode - the reader will always be woken by the input worker
3. Non-canonical modes
a. MIN == 0, TIME == 0
b. MIN == 0, TIME > 0
c. MIN > 0, TIME > 0
minimum_to_wake is always 1 in these modes so the reader will always
be woken by the input worker
d. MIN > 0, TIME == 0
although the reader will not be woken by the input worker unless the
minimum data is received, the reader would not otherwise have
returned the received data
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/n_tty.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index b09023b07169..ff728d32cb53 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -1179,8 +1179,6 @@ static void n_tty_receive_break(struct tty_struct *tty) put_tty_queue('\0', ldata); } put_tty_queue('\0', ldata); - if (waitqueue_active(&tty->read_wait)) - wake_up_interruptible_poll(&tty->read_wait, POLLIN); } /** @@ -1237,8 +1235,6 @@ static void n_tty_receive_parity_error(struct tty_struct *tty, unsigned char c) put_tty_queue('\0', ldata); } else put_tty_queue(c, ldata); - if (waitqueue_active(&tty->read_wait)) - wake_up_interruptible_poll(&tty->read_wait, POLLIN); } static void |