tty: cyclades: drop broken alt-speed support

Setting an alt_speed using the ASYNC_SPD flags has been deprecated since
v2.1.69, and has been broken since v3.10 and commit 6865ff222cca ("TTY:
do not warn about setting speed via SPD_*") without anyone noticing.

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

Note that using ASYNC_SPD_CUST is still supported.

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>

1 files changed, 9 insertions, 12 deletions

diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c
index 104f09c58163..d272bc4e7fb5 100644
--- a/drivers/tty/cyclades.c
+++ b/drivers/tty/cyclades.c
@@ -1975,18 +1975,6 @@ static void cy_set_line_char(struct cyclades_port *info, struct tty_struct *tty)
         cflag = tty->termios.c_cflag;
         iflag = tty->termios.c_iflag;
 
-        /*
-         * Set up the tty->alt_speed kludge
-         */
-        if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
-                tty->alt_speed = 57600;
-        if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
-                tty->alt_speed = 115200;
-        if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
-                tty->alt_speed = 230400;
-        if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
-                tty->alt_speed = 460800;
-
         card = info->card;
         channel = info->line - card->first_line;
 
@@ -2295,12 +2283,16 @@ cy_set_serial_info(struct cyclades_port *info, struct tty_struct *tty,
                 struct serial_struct __user *new_info)
 {
         struct serial_struct new_serial;
+        int old_flags;
         int ret;
 
         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
                 return -EFAULT;
 
         mutex_lock(&info->port.mutex);
+
+        old_flags = info->port.flags;
+
         if (!capable(CAP_SYS_ADMIN)) {
                 if (new_serial.close_delay != info->port.close_delay ||
                                 new_serial.baud_base != info->baud ||
@@ -2332,6 +2324,11 @@ cy_set_serial_info(struct cyclades_port *info, struct tty_struct *tty,
 
 check_and_exit:
         if (tty_port_initialized(&info->port)) {
+                if ((new_serial.flags ^ old_flags) & ASYNC_SPD_MASK) {
+                        /* warn about deprecation unless clearing */
+                        if (new_serial.flags & ASYNC_SPD_MASK)
+                                dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
+                }
                 cy_set_line_char(info, tty);
                 ret = 0;
         } else {