This is a note to let you know that I've just added the patch titled
hwmon: (sht15) Fix integer overflow in humidity calculation
to the 2.6.38-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hwmon-sht15-fix-integer-overflow-in-humidity-calculation.patch
and it can be found in the queue-2.6.38 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From ccd32e735de7a941906e093f8dca924bb05c5794 Mon Sep 17 00:00:00 2001
From: Vivien Didelot <[email protected]>
Date: Mon, 21 Mar 2011 17:59:35 +0100
Subject: hwmon: (sht15) Fix integer overflow in humidity calculation
From: Vivien Didelot <[email protected]>
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 <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/hwmon/sht15.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -333,11 +333,11 @@ static inline int sht15_calc_humid(struc
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;
}
Patches currently in stable-queue which might be from
[email protected] are
queue-2.6.38/hwmon-sht15-fix-integer-overflow-in-humidity-calculation.patch
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