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hwmon: (lm95241) Check validity of input values 

This clears the following build-time warnings I was seeing:

drivers/hwmon/lm95241.c: In function "set_interval":
drivers/hwmon/lm95241.c:132:15: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_max2":
drivers/hwmon/lm95241.c:278:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_max1":
drivers/hwmon/lm95241.c:277:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_min2":
drivers/hwmon/lm95241.c:249:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_min1":
drivers/hwmon/lm95241.c:248:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_type2":
drivers/hwmon/lm95241.c:220:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_type1":
drivers/hwmon/lm95241.c:219:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result

This also fixes a small race in set_interval() as a side effect: by
working with a temporary local variable we prevent data->interval from
being accessed at a time it contains the interval value in the wrong
unit.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Davide Rizzo <elpa.rizzo@gmail.com>
This commit is contained in:
Jean Delvare 2010-11-15 21:38:56 +01:00 committed by Jean Delvare
parent 2aa25c22c4
commit 61ec2da506
1 changed files with 14 additions and 5 deletions
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19
drivers/hwmon/lm95241.c
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@ -128,9 +128,12 @@ static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95241_data *data = i2c_get_clientdata(client);
unsigned long val;
strict_strtol(buf, 10, &data->interval);
data->interval = data->interval * HZ / 1000;
if (strict_strtoul(buf, 10, &val) < 0)
return -EINVAL;
data->interval = val * HZ / 1000;
return count;
}
@ -188,7 +191,9 @@ static ssize_t set_type##flag(struct device *dev, \
struct lm95241_data *data = i2c_get_clientdata(client); \
\
long val; \
strict_strtol(buf, 10, &val); \
\
if (strict_strtol(buf, 10, &val) < 0) \
return -EINVAL; \
\
if ((val == 1) || (val == 2)) { \
\
@ -227,7 +232,9 @@ static ssize_t set_min##flag(struct device *dev, \
struct lm95241_data *data = i2c_get_clientdata(client); \
\
long val; \
strict_strtol(buf, 10, &val); \
\
if (strict_strtol(buf, 10, &val) < 0) \
return -EINVAL;\
\
mutex_lock(&data->update_lock); \
\
@ -256,7 +263,9 @@ static ssize_t set_max##flag(struct device *dev, \
struct lm95241_data *data = i2c_get_clientdata(client); \
\
long val; \
strict_strtol(buf, 10, &val); \
\
if (strict_strtol(buf, 10, &val) < 0) \
return -EINVAL; \
\
mutex_lock(&data->update_lock); \
\