USB: ftdi_sio: fixed handling of unsupported CSIZE setting

commit 8704211f65a2106ba01b6ac9727cdaf9ca11594c upstream.

FTDI UARTs support only 7 or 8 data bits. Until now the ftdi_sio driver would
only report this limitation for CS6 to dmesg and fail to reflect this fact to
tcgetattr.

This patch reverts the unsupported CSIZE setting and reports the fact with less
severance to dmesg for both CS5 and CS6.

To test the patch it's sufficient to call

    stty -F /dev/ttyUSB0 cs5

which will succeed without the patch and report an error with the patch
applied.

As an additional fix this patch ensures that the control request will always
include a data bit size.

Signed-off-by: Colin Leitner <colin.leitner@gmail.com>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index aa3aed5458a6690926d8e4c388ea788ba5eabc9c..92549cc4665f6f7428c4eaf10ed1808a2e4677ec 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2131,6 +2131,20 @@ static void ftdi_set_termios(struct tty_struct *tty,
                termios->c_cflag |= CRTSCTS;
        }
 
+       /*
+        * All FTDI UART chips are limited to CS7/8. We won't pretend to
+        * support CS5/6 and revert the CSIZE setting instead.
+        */
+       if ((C_CSIZE(tty) != CS8) && (C_CSIZE(tty) != CS7)) {
+               dev_warn(ddev, "requested CSIZE setting not supported\n");
+
+               termios->c_cflag &= ~CSIZE;
+               if (old_termios)
+                       termios->c_cflag |= old_termios->c_cflag & CSIZE;
+               else
+                       termios->c_cflag |= CS8;
+       }
+
        cflag = termios->c_cflag;
 
        if (!old_termios)
@@ -2167,19 +2181,16 @@ no_skip:
        } else {
                urb_value |= FTDI_SIO_SET_DATA_PARITY_NONE;
        }
-       if (cflag & CSIZE) {
-               switch (cflag & CSIZE) {
-               case CS7:
-                       urb_value |= 7;
-                       dev_dbg(ddev, "Setting CS7\n");
-                       break;
-               case CS8:
-                       urb_value |= 8;
-                       dev_dbg(ddev, "Setting CS8\n");
-                       break;
-               default:
-                       dev_err(ddev, "CSIZE was set but not CS7-CS8\n");
-               }
+       switch (cflag & CSIZE) {
+       case CS7:
+               urb_value |= 7;
+               dev_dbg(ddev, "Setting CS7\n");
+               break;
+       default:
+       case CS8:
+               urb_value |= 8;
+               dev_dbg(ddev, "Setting CS8\n");
+               break;
        }
 
        /* This is needed by the break command since it uses the same command