diff options
author | Vivien Didelot <vivien.didelot@savoirfairelinux.com> | 2011-03-21 17:59:35 +0100 |
---|---|---|
committer | AK <andi@firstfloor.org> | 2011-03-31 11:58:43 -0700 |
commit | 4d5afe547f5edb659a7813d8190842da14618808 (patch) | |
tree | f146013659e588a90c9fa2100ae51a8b028dc125 /drivers | |
parent | ef8844ee3f2c657b1e5a92250721dc1c73c96c9a (diff) |
hwmon: (sht15) Fix integer overflow in humidity calculation
commit ccd32e735de7a941906e093f8dca924bb05c5794 upstream.
An integer overflow occurs in the calculation of RHlinear when the
relative humidity is greater than around 30%. The consequence is a subtle
(but noticeable) error in the resulting humidity measurement.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/hwmon/sht15.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/hwmon/sht15.c b/drivers/hwmon/sht15.c index a610e7880fb3..38a41d27f3da 100644 --- a/drivers/hwmon/sht15.c +++ b/drivers/hwmon/sht15.c @@ -333,11 +333,11 @@ static inline int sht15_calc_humid(struct sht15_data *data) const int c1 = -4; const int c2 = 40500; /* x 10 ^ -6 */ - const int c3 = -2800; /* x10 ^ -9 */ + const int c3 = -28; /* x 10 ^ -7 */ RHlinear = c1*1000 + c2 * data->val_humid/1000 - + (data->val_humid * data->val_humid * c3)/1000000; + + (data->val_humid * data->val_humid * c3) / 10000; return (temp - 25000) * (10000 + 80 * data->val_humid) / 1000000 + RHlinear; } |