[PATCH 4.9 43/62] USB: serial: whiteheat: fix line-speed endianness

Greg Kroah-Hartman
2019-11-04T21:51:12Z

From: Johan Hovold <johan@kernel.org>

commit 84968291d7924261c6a0624b9a72f952398e258b upstream.

Add missing endianness conversion when setting the line speed so that
this driver might work also on big-endian machines.

Also use an unsigned format specifier in the corresponding debug
message.

Signed-off-by: Johan Hovold <johan@kernel.org>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191029102354.2733-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/serial/whiteheat.c | 9 ++++++---
drivers/usb/serial/whiteheat.h | 2 +-
2 files changed, 7 insertions(+), 4 deletions(-)

--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -681,6 +681,7 @@ static void firm_setup_port(struct tty_s
struct device *dev = &port->dev;
struct whiteheat_port_settings port_settings;
unsigned int cflag = tty->termios.c_cflag;
+ speed_t baud;

port_settings.port = port->port_number + 1;

@@ -741,11 +742,13 @@ static void firm_setup_port(struct tty_s
dev_dbg(dev, "%s - XON = %2x, XOFF = %2x\n", __func__, port_settings.xon, port_settings.xoff);

/* get the baud rate wanted */
- port_settings.baud = tty_get_baud_rate(tty);
- dev_dbg(dev, "%s - baud rate = %d\n", __func__, port_settings.baud);
+ baud = tty_get_baud_rate(tty);
+ port_settings.baud = cpu_to_le32(baud);
+ dev_dbg(dev, "%s - baud rate = %u\n", __func__, baud);

/* fixme: should set validated settings */
- tty_encode_baud_rate(tty, port_settings.baud, port_settings.baud);
+ tty_encode_baud_rate(tty, baud, baud);
+
/* handle any settings that aren't specified in the tty structure */
port_settings.lloop = 0;

--- a/drivers/usb/serial/whiteheat.h
+++ b/drivers/usb/serial/whiteheat.h
@@ -91,7 +91,7 @@ struct whiteheat_simple {

struct whiteheat_port_settings {
__u8 port; /* port number (1 to N) */
- __u32 baud; /* any value 7 - 460800, firmware calculates
+ __le32 baud; /* any value 7 - 460800, firmware calculates
best fit; arrives little endian */
__u8 bits; /* 5, 6, 7, or 8 */
__u8 stop; /* 1 or 2, default 1 (2 = 1.5 if bits = 5) */