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authorNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>2014-07-14 16:09:59 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-17 18:14:44 -0700
commitbcb9973a6097652a12660958449301aada41de9c (patch)
tree4987eefdf083b0bf5120462de8243a8b94453eb4 /drivers/tty
parentb7d66397f4d282ddf2a2fe516fc9329c5a063459 (diff)
serial: sh-sci: Fix range check of bit-rate for HSCIF
If bit-rate calculation result of HSCIF is expect 255 from 0, driver does not calculate error bit. However, we need to round the value to calculate error bit in the case of negative value. This rounds the value of bit-rate using clamp(), and bit-rate is the case of negative value, it enables the calculation of the error bit. Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/sh-sci.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 2ba42069922..091b65587c7 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1791,8 +1791,7 @@ static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq,
/* integerized formulas from HSCIF documentation */
br = DIV_ROUND_CLOSEST(freq, (sr *
(1 << (2 * c + 1)) * bps)) - 1;
- if (br < 0 || br > 255)
- continue;
+ br = clamp(br, 0, 255);
err = DIV_ROUND_CLOSEST(freq, ((br + 1) * bps * sr *
(1 << (2 * c + 1)) / 1000)) -
1000;