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tty: rocket: drop broken alt-speed support 

Setting an alt_speed using the ROCKET_SPD flags has been deprecated
since v2.1.69, and has been broken since commit 6865ff222c ("TTY: do
not warn about setting speed via SPD_*") without anyone noticing.

To make things worse commit 6df3526b66 ("rocket: first pass at termios
reporting") in v2.6.25 started reporting back the actual baud rate used,
something which also required 38400 to again be set whenever changing a
SPD flag.

Drop the broken alt-speed handling altogether, and add a ratelimited
warning about using TIOCCSERIAL to change speed as being deprecated.

Note that the rocket driver has never supported using a custom divisor
(ASYNC_SPD_CUST equivalent).

Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-06-06 12:54:39 +02:00 committed by Greg Kroah-Hartman
parent d1b8bc3bc2
commit 48a7bd1178
1 changed files with 6 additions and 21 deletions
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27
drivers/tty/rocket.c
View File

@ -947,18 +947,6 @@ static int rp_open(struct tty_struct *tty, struct file *filp)
tty_port_set_initialized(&info->port, 1);
/*
* Set up the tty->alt_speed kludge
*/
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_HI)
tty->alt_speed = 57600;
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_VHI)
tty->alt_speed = 115200;
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_SHI)
tty->alt_speed = 230400;
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_WARP)
tty->alt_speed = 460800;
configure_r_port(tty, info, NULL);
if (C_BAUD(tty)) {
sSetDTR(cp);
@ -1219,23 +1207,20 @@ static int set_config(struct tty_struct *tty, struct r_port *info,
return -EPERM;
}
info->flags = ((info->flags & ~ROCKET_USR_MASK) | (new_serial.flags & ROCKET_USR_MASK));
configure_r_port(tty, info, NULL);
mutex_unlock(&info->port.mutex);
return 0;
}
if ((new_serial.flags ^ info->flags) & ROCKET_SPD_MASK) {
/* warn about deprecation, unless clearing */
if (new_serial.flags & ROCKET_SPD_MASK)
dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
}
info->flags = ((info->flags & ~ROCKET_FLAGS) | (new_serial.flags & ROCKET_FLAGS));
info->port.close_delay = new_serial.close_delay;
info->port.closing_wait = new_serial.closing_wait;
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_HI)
tty->alt_speed = 57600;
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_VHI)
tty->alt_speed = 115200;
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_SHI)
tty->alt_speed = 230400;
if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_WARP)
tty->alt_speed = 460800;
mutex_unlock(&info->port.mutex);
configure_r_port(tty, info, NULL);