diff options
Diffstat (limited to 'drivers/tty/n_tty.c')
| -rw-r--r-- | drivers/tty/n_tty.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 94b6eda87af..ee1c268f5f9 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -1630,6 +1630,7 @@ static int copy_from_read_buf(struct tty_struct *tty, int retval; size_t n; unsigned long flags; + bool is_eof; retval = 0; spin_lock_irqsave(&tty->read_lock, flags); @@ -1639,15 +1640,15 @@ static int copy_from_read_buf(struct tty_struct *tty, if (n) { retval = copy_to_user(*b, &tty->read_buf[tty->read_tail], n); n -= retval; + is_eof = n == 1 && + tty->read_buf[tty->read_tail] == EOF_CHAR(tty); tty_audit_add_data(tty, &tty->read_buf[tty->read_tail], n); spin_lock_irqsave(&tty->read_lock, flags); tty->read_tail = (tty->read_tail + n) & (N_TTY_BUF_SIZE-1); tty->read_cnt -= n; /* Turn single EOF into zero-length read */ - if (L_EXTPROC(tty) && tty->icanon && n == 1) { - if (!tty->read_cnt && (*b)[n-1] == EOF_CHAR(tty)) - n--; - } + if (L_EXTPROC(tty) && tty->icanon && is_eof && !tty->read_cnt) + n = 0; spin_unlock_irqrestore(&tty->read_lock, flags); *b += n; *nr -= n; |