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From: Guenter Roeck <guenter.roeck@ericsson.com>
To: lm-sensors@vger.kernel.org
Subject: [lm-sensors] [PATCH] pmbus: Use long variables for register to data
Date: Mon, 11 Jul 2011 19:04:24 +0000	[thread overview]
Message-ID: <1310411064-16337-1-git-send-email-guenter.roeck@ericsson.com> (raw)

Using integer variable types for register to data conversions can cause
overflows especially for power calculations, which are in microwatt.
Use long variables instead.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
---
 drivers/hwmon/pmbus_core.c |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/hwmon/pmbus_core.c b/drivers/hwmon/pmbus_core.c
index 744672c..8e31a8e 100644
--- a/drivers/hwmon/pmbus_core.c
+++ b/drivers/hwmon/pmbus_core.c
@@ -362,8 +362,8 @@ static struct pmbus_data *pmbus_update_device(struct device *dev)
  * Convert linear sensor values to milli- or micro-units
  * depending on sensor type.
  */
-static int pmbus_reg2data_linear(struct pmbus_data *data,
-				 struct pmbus_sensor *sensor)
+static long pmbus_reg2data_linear(struct pmbus_data *data,
+				  struct pmbus_sensor *sensor)
 {
 	s16 exponent;
 	s32 mantissa;
@@ -397,15 +397,15 @@ static int pmbus_reg2data_linear(struct pmbus_data *data,
 	else
 		val >>= -exponent;
 
-	return (int)val;
+	return val;
 }
 
 /*
  * Convert direct sensor values to milli- or micro-units
  * depending on sensor type.
  */
-static int pmbus_reg2data_direct(struct pmbus_data *data,
-				 struct pmbus_sensor *sensor)
+static long pmbus_reg2data_direct(struct pmbus_data *data,
+				  struct pmbus_sensor *sensor)
 {
 	long val = (s16) sensor->data;
 	long m, b, R;
@@ -440,12 +440,12 @@ static int pmbus_reg2data_direct(struct pmbus_data *data,
 		R++;
 	}
 
-	return (int)((val - b) / m);
+	return (val - b) / m;
 }
 
-static int pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
+static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
 {
-	int val;
+	long val;
 
 	if (data->info->direct[sensor->class])
 		val = pmbus_reg2data_direct(data, sensor);
@@ -619,7 +619,7 @@ static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
 	if (!s1 && !s2)
 		*val = !!regval;
 	else {
-		int v1, v2;
+		long v1, v2;
 		struct pmbus_sensor *sensor1, *sensor2;
 
 		sensor1 = &data->sensors[s1];
@@ -661,7 +661,7 @@ static ssize_t pmbus_show_sensor(struct device *dev,
 	if (sensor->data < 0)
 		return sensor->data;
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", pmbus_reg2data(data, sensor));
+	return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
 }
 
 static ssize_t pmbus_set_sensor(struct device *dev,
-- 
1.7.3.1


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             reply	other threads:[~2011-07-11 19:04 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-11 19:04 Guenter Roeck [this message]
2011-07-12  7:00 ` [lm-sensors] [PATCH] pmbus: Use long variables for register to Jean Delvare
2011-07-12 13:40 ` Guenter Roeck
2011-07-12 16:03 ` Jean Delvare
2011-07-12 16:25 ` Guenter Roeck

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