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tty: some ICANON magic is in the wrong places

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Move the set up on ldisc change into the ldisc
Move the INQ/OUTQ cases into the driver not in shared ioctl code where it
gives bogus answers for other ldisc values

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox
2008-10-13 10:44:17 +01:00
committed by Linus Torvalds
parent fe6e29fdb1
commit 47afa7a5a8
5 changed files with 56 additions and 45 deletions
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42
drivers/char/tty_ioctl.c
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@@ -489,7 +489,6 @@ EXPORT_SYMBOL(tty_termios_hw_change);
static void change_termios(struct tty_struct *tty, struct ktermios *new_termios)
{
int canon_change;
struct ktermios old_termios;
struct tty_ldisc *ld;
unsigned long flags;
@@ -505,18 +504,6 @@ static void change_termios(struct tty_struct *tty, struct ktermios *new_termios)
old_termios = *tty->termios;
*tty->termios = *new_termios;
unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON;
if (canon_change) {
memset(&tty->read_flags, 0, sizeof tty->read_flags);
tty->canon_head = tty->read_tail;
tty->canon_data = 0;
tty->erasing = 0;
}
/* This bit should be in the ldisc code */
if (canon_change && !L_ICANON(tty) && tty->read_cnt)
/* Get characters left over from canonical mode. */
wake_up_interruptible(&tty->read_wait);
/* See if packet mode change of state. */
if (tty->link && tty->link->packet) {
@@ -677,24 +664,6 @@ static int set_termiox(struct tty_struct *tty, void __user *arg, int opt)
#endif
static unsigned long inq_canon(struct tty_struct *tty)
{
int nr, head, tail;
if (!tty->canon_data || !tty->read_buf)
return 0;
head = tty->canon_head;
tail = tty->read_tail;
nr = (head - tail) & (N_TTY_BUF_SIZE-1);
/* Skip EOF-chars.. */
while (head != tail) {
if (test_bit(tail, tty->read_flags) &&
tty->read_buf[tail] == __DISABLED_CHAR)
nr--;
tail = (tail+1) & (N_TTY_BUF_SIZE-1);
}
return nr;
}
#ifdef TIOCGETP
/*
@@ -1110,7 +1079,7 @@ int tty_perform_flush(struct tty_struct *tty, unsigned long arg)
}
EXPORT_SYMBOL_GPL(tty_perform_flush);
int n_tty_ioctl(struct tty_struct *tty, struct file *file,
int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
unsigned long flags;
@@ -1148,13 +1117,6 @@ int n_tty_ioctl(struct tty_struct *tty, struct file *file,
return 0;
case TCFLSH:
return tty_perform_flush(tty, arg);
case TIOCOUTQ:
return put_user(tty_chars_in_buffer(tty), (int __user *) arg);
case TIOCINQ:
retval = tty->read_cnt;
if (L_ICANON(tty))
retval = inq_canon(tty);
return put_user(retval, (unsigned int __user *) arg);
case TIOCPKT:
{
int pktmode;
@@ -1180,4 +1142,4 @@ int n_tty_ioctl(struct tty_struct *tty, struct file *file,
return tty_mode_ioctl(tty, file, cmd, arg);
}
}
EXPORT_SYMBOL(n_tty_ioctl);
EXPORT_SYMBOL(n_tty_ioctl_helper);