Patch "staging: iio: tsl2x7x_core: Fix standard deviation calculation" has been added to the 4.9-stable tree

Patch "staging: iio: tsl2x7x_core: Fix standard deviation calculation" has been added to the 4.9-stable tree

[gregkh]

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

    staging: iio: tsl2x7x_core: Fix standard deviation calculation

to the 4.9-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:
     staging-iio-tsl2x7x_core-fix-standard-deviation-calculation.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cf6c77323a96fc40309cc8a4921ef206cccdd961 Mon Sep 17 00:00:00 2001
From: Eva Rachel Retuya <eraretuya@gmail.com>
Date: Mon, 20 Mar 2017 19:27:05 +0800
Subject: staging: iio: tsl2x7x_core: Fix standard deviation calculation

From: Eva Rachel Retuya <eraretuya@gmail.com>

commit cf6c77323a96fc40309cc8a4921ef206cccdd961 upstream.

Standard deviation is calculated as the square root of the variance
where variance is the mean of sample_sum and length. Correct the
computation of statP->stddev in accordance to the proper calculation.

Fixes: 3c97c08b5735 ("staging: iio: add TAOS tsl2x7x driver")
Reported-by: Abhiram Balasubramanian <abhiram@cs.utah.edu>
Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/staging/iio/light/tsl2x7x_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/iio/light/tsl2x7x_core.c
+++ b/drivers/staging/iio/light/tsl2x7x_core.c
@@ -854,7 +854,7 @@ void tsl2x7x_prox_calculate(int *data, i
 		tmp = data[i] - statP->mean;
 		sample_sum += tmp * tmp;
 	}
-	statP->stddev = int_sqrt((long)sample_sum) / length;
+	statP->stddev = int_sqrt((long)sample_sum / length);
 }
 
 /**


Patches currently in stable-queue which might be from eraretuya@gmail.com are

queue-4.9/staging-iio-tsl2x7x_core-fix-standard-deviation-calculation.patch