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-rw-r--r--drivers/char/n_tty.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 3922a084205..f6f0e4ec2b5 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -1352,10 +1352,8 @@ static void n_tty_write_wakeup(struct tty_struct *tty)
/* Write out any echoed characters that are still pending */
process_echoes(tty);
- if (tty->fasync) {
- set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+ if (tty->fasync && test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags))
kill_fasync(&tty->fasync, SIGIO, POLL_OUT);
- }
}
/**
@@ -2014,6 +2012,8 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
break_out:
__set_current_state(TASK_RUNNING);
remove_wait_queue(&tty->write_wait, &wait);
+ if (b - buf != nr && tty->fasync)
+ set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
return (b - buf) ? b - buf : retval;
}