There was 32-bit calculation overflow. Use div_u64.
Signed-off-by: Antti Palosaari <cr...@iki.fi>
---
drivers/media/dvb-frontends/m88ds3103.c | 4 ++--
drivers/media/dvb-frontends/m88ds3103_priv.h | 1 +
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/media/dvb-frontends/m88ds3103.c
b/drivers/media/dvb-frontends/m88ds3103.c
index 2ef8ce1..4176edf 100644
--- a/drivers/media/dvb-frontends/m88ds3103.c
+++ b/drivers/media/dvb-frontends/m88ds3103.c
@@ -879,7 +879,7 @@ static int m88ds3103_read_snr(struct dvb_frontend *fe, u16
*snr)
/* SNR(X) dB = 10 * ln(X) / ln(10) dB */
tmp = DIV_ROUND_CLOSEST(tmp, 8 * M88DS3103_SNR_ITERATIONS);
if (tmp)
- *snr = 100ul * intlog2(tmp) / intlog2(10);
+ *snr = div_u64((u64) 100 * intlog2(tmp), intlog2(10));
else
*snr = 0;
break;
@@ -908,7 +908,7 @@ static int m88ds3103_read_snr(struct dvb_frontend *fe, u16
*snr)
/* SNR(X) dB = 10 * log10(X) dB */
if (signal > noise) {
tmp = signal / noise;
- *snr = 100ul * intlog10(tmp) / (1 << 24);
+ *snr = div_u64((u64) 100 * intlog10(tmp), (1 << 24));
} else {
*snr = 0;
}
diff --git a/drivers/media/dvb-frontends/m88ds3103_priv.h
b/drivers/media/dvb-frontends/m88ds3103_priv.h
index 84c3c06..e73db5c 100644
--- a/drivers/media/dvb-frontends/m88ds3103_priv.h
+++ b/drivers/media/dvb-frontends/m88ds3103_priv.h
@@ -22,6 +22,7 @@
#include "dvb_math.h"
#include <linux/firmware.h>
#include <linux/i2c-mux.h>
+#include <linux/math64.h>
#define M88DS3103_FIRMWARE "dvb-demod-m88ds3103.fw"
#define M88DS3103_MCLK_KHZ 96000
--
1.9.3
--
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