[PATCH 3.16 022/233] USB: serial: mct_u232: fix big-endian baud-rate handling

From: Ben Hutchings
Date: Sat Sep 09 2017 - 19:34:48 EST


3.16.48-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@xxxxxxxxxx>

commit 26cede343656c0bc2c33cdc783771282405c7fb2 upstream.

Drop erroneous cpu_to_le32 when setting the baud rate, something which
corrupted the divisor on big-endian hosts.

Found using sparse:

warning: incorrect type in argument 1 (different base types)
expected unsigned int [unsigned] [usertype] val
got restricted __le32 [usertype] <noident>

Fixes: af2ac1a091bc ("USB: serial mct_usb232: move DMA buffers to heap")
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Acked-By: Pete Zaitcev <zaitcev@xxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/usb/serial/mct_u232.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -189,7 +189,7 @@ static int mct_u232_set_baud_rate(struct
return -ENOMEM;

divisor = mct_u232_calculate_baud_rate(serial, value, &speed);
- put_unaligned_le32(cpu_to_le32(divisor), buf);
+ put_unaligned_le32(divisor, buf);
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_BAUD_RATE_REQUEST,
MCT_U232_SET_REQUEST_TYPE,