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 <stable@xxxxxxxxxxxxxxx> know about it. >From ed3730c435f1a9f9559ed7762035d22d8a95adfe Mon Sep 17 00:00:00 2001 From: Andreas Klinger <ak@xxxxxxxxxxxxx> Date: Mon, 10 Apr 2017 19:00:01 +0200 Subject: IIO: bmp280-core.c: fix error in humidity calculation From: Andreas Klinger <ak@xxxxxxxxxxxxx> 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. Signed-off-by: Andreas Klinger <ak@xxxxxxxxxxxxx> Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Reviewed-by: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx> Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/iio/pressure/bmp280-core.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) --- a/drivers/iio/pressure/bmp280-core.c +++ b/drivers/iio/pressure/bmp280-core.c @@ -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 ak@xxxxxxxxxxxxx are queue-4.11/iio-bmp280-core.c-fix-error-in-humidity-calculation.patch