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n_tty: Simplify throttle threshold calculation 

The adjustments performed by receive_room() are to ensure a line
termination can always be written to the read buffer. However,
these adjustments are irrelevant to the throttle threshold (because
the threshold < buffer limit).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Peter Hurley 2015-01-16 15:05:36 -05:00 committed by Greg Kroah-Hartman
parent a342846f9b
commit 5e28cca153
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/n_tty.c
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@ -262,7 +262,7 @@ static void n_tty_check_throttle(struct tty_struct *tty)
while (1) {
int throttled;
tty_set_flow_change(tty, TTY_THROTTLE_SAFE);
if (receive_room(tty) >= TTY_THRESHOLD_THROTTLE)
if (N_TTY_BUF_SIZE - read_cnt(ldata) >= TTY_THRESHOLD_THROTTLE)
break;
throttled = tty_throttle_safe(tty);
if (!throttled)