diff options
author | Jann Horn <jannh@google.com> | 2020-12-03 03:03:31 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-04 16:54:35 +0100 |
commit | e0efb3168d34dc8c8c72718672b8902e40efff8f (patch) | |
tree | 87013228ece3aae052680f1ae21e13af12e581ee /drivers/tty | |
parent | tty/serial/imx: Enable TXEN bit in imx_poll_init(). (diff) | |
download | linux-e0efb3168d34dc8c8c72718672b8902e40efff8f.tar.xz linux-e0efb3168d34dc8c8c72718672b8902e40efff8f.zip |
tty: Remove dead termiox code
set_termiox() and the TCGETX handler bail out with -EINVAL immediately
if ->termiox is NULL, but there are no code paths that can set
->termiox to a non-NULL pointer; and no such code paths seem to have
existed since the termiox mechanism was introduced back in
commit 1d65b4a088de ("tty: Add termiox") in v2.6.28.
Similarly, no driver actually implements .set_termiox; and it looks like
no driver ever has.
Delete this dead code; but leave the definition of struct termiox in the
UAPI headers intact.
Signed-off-by: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/r/20201203020331.2394754-1-jannh@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r-- | drivers/tty/tty_ioctl.c | 61 |
1 files changed, 2 insertions, 59 deletions
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c index e18f318586ab..4de1c6ddb8ff 100644 --- a/drivers/tty/tty_ioctl.c +++ b/drivers/tty/tty_ioctl.c @@ -443,51 +443,6 @@ static int get_termio(struct tty_struct *tty, struct termio __user *termio) return 0; } - -#ifdef TCGETX - -/** - * set_termiox - set termiox fields if possible - * @tty: terminal - * @arg: termiox structure from user - * @opt: option flags for ioctl type - * - * Implement the device calling points for the SYS5 termiox ioctl - * interface in Linux - */ - -static int set_termiox(struct tty_struct *tty, void __user *arg, int opt) -{ - struct termiox tnew; - struct tty_ldisc *ld; - - if (tty->termiox == NULL) - return -EINVAL; - if (copy_from_user(&tnew, arg, sizeof(struct termiox))) - return -EFAULT; - - ld = tty_ldisc_ref(tty); - if (ld != NULL) { - if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) - ld->ops->flush_buffer(tty); - tty_ldisc_deref(ld); - } - if (opt & TERMIOS_WAIT) { - tty_wait_until_sent(tty, 0); - if (signal_pending(current)) - return -ERESTARTSYS; - } - - down_write(&tty->termios_rwsem); - if (tty->ops->set_termiox) - tty->ops->set_termiox(tty, &tnew); - up_write(&tty->termios_rwsem); - return 0; -} - -#endif - - #ifdef TIOCGETP /* * These are deprecated, but there is limited support.. @@ -815,23 +770,11 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file, return ret; #endif #ifdef TCGETX - case TCGETX: { - struct termiox ktermx; - if (real_tty->termiox == NULL) - return -EINVAL; - down_read(&real_tty->termios_rwsem); - memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox)); - up_read(&real_tty->termios_rwsem); - if (copy_to_user(p, &ktermx, sizeof(struct termiox))) - ret = -EFAULT; - return ret; - } + case TCGETX: case TCSETX: - return set_termiox(real_tty, p, 0); case TCSETXW: - return set_termiox(real_tty, p, TERMIOS_WAIT); case TCSETXF: - return set_termiox(real_tty, p, TERMIOS_FLUSH); + return -EINVAL; #endif case TIOCGSOFTCAR: copy_termios(real_tty, &kterm); |