Patch "IIO: bmp280-core.c: fix error in humidity calculation" has been added to the 4.11-stable tree

This is a note to let you know that I've just added the patch titled

IIO: bmp280-core.c: fix error in humidity calculation

to the 4.11-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:
iio-bmp280-core.c-fix-error-in-humidity-calculation.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andreas Klinger <[email protected]>
Date: Mon, 10 Apr 2017 19:00:01 +0200
Subject: IIO: bmp280-core.c: fix error in humidity calculation

From: Andreas Klinger <[email protected]>

commit ed3730c435f1a9f9559ed7762035d22d8a95adfe upstream.

While calculating the compensation of the humidity there are negative values interpreted as unsigned because of unsigned variables used. These values as well as the constants need to be casted to signed as indicated by the documentation of the sensor.

---
 drivers/iio/pressure/bmp280-core.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

@@ -175,11 +175,12 @@ static u32 bmp280_compensate_humidity(st
 	}
 	H6 = sign_extend32(tmp, 7);
 
-	var = ((s32)data->t_fine) - 76800;
-	var = ((((adc_humidity << 14) - (H4 << 20) - (H5 * var)) + 16384) >> 15)
-		* (((((((var * H6) >> 10) * (((var * H3) >> 11) + 32768)) >> 10)
-		+ 2097152) * H2 + 8192) >> 14);
-	var -= ((((var >> 15) * (var >> 15)) >> 7) * H1) >> 4;
+	var = ((s32)data->t_fine) - (s32)76800;
+	var = ((((adc_humidity << 14) - (H4 << 20) - (H5 * var))
+		+ (s32)16384) >> 15) * (((((((var * H6) >> 10)
+		* (((var * (s32)H3) >> 11) + (s32)32768)) >> 10)
+		+ (s32)2097152) * H2 + 8192) >> 14);
+	var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)H1) >> 4;
 
 	return var >> 12;
 };

Patches currently in stable-queue which might be from [email protected] are

queue-4.11/iio-bmp280-core.c-fix-error-in-humidity-calculation.patch