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authorGeert Uytterhoeven <geert+renesas@glider.be>2015-11-13 16:56:08 +0100
committerGeert Uytterhoeven <geert+renesas@glider.be>2015-12-17 11:18:27 +0100
commit95a2703e36530c09a9416321ec21c062f3e91d01 (patch)
treed1c3fb3d9fb56308f97ea38405c78abbeb989ea5 /drivers/tty
parentf4de472ef2ff8937b04d5da9d885c78fcbd4c171 (diff)
downloadlinux-95a2703e36530c09a9416321ec21c062f3e91d01.tar.bz2
serial: sh-sci: Make unsigned values in sci_baud_calc_hscif() unsigned
Move the -1 offset of br to the assignment to *brr, so br cannot become negative anymore, and update the clamp() call. Now all unsigned values in sci_baud_calc_hscif() can become unsigned. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/sh-sci.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index b9eb4b525c0a..77e0a582da44 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1870,7 +1870,8 @@ static unsigned int sci_scbrr_calc(struct sci_port *s, unsigned int bps,
static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq, int *brr,
unsigned int *srr, unsigned int *cks)
{
- int sr, c, br, err, recv_margin;
+ unsigned int sr, br, c;
+ int err, recv_margin;
int min_err = 1000; /* 100% */
int recv_max_margin = 0;
@@ -1880,9 +1881,9 @@ static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq, int *brr,
for (c = 0; c <= 3; c++) {
/* integerized formulas from HSCIF documentation */
br = DIV_ROUND_CLOSEST(freq, (sr *
- (1 << (2 * c + 1)) * bps)) - 1;
- br = clamp(br, 0, 255);
- err = DIV_ROUND_CLOSEST(freq, ((br + 1) * bps * sr *
+ (1 << (2 * c + 1)) * bps));
+ br = clamp(br, 1U, 256U);
+ err = DIV_ROUND_CLOSEST(freq, (br * bps * sr *
(1 << (2 * c + 1)) / 1000)) -
1000;
/* Calc recv margin
@@ -1908,7 +1909,7 @@ static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq, int *brr,
else
continue;
- *brr = br;
+ *brr = br - 1;
*srr = sr - 1;
*cks = c;
}