linux-kernel - [PATCH 4.9 25/60] staging: iio: tsl2x7x_core: Fix standard deviation calculation

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Message-Id: <20170619151645.591782773@linuxfoundation.org>
Date:   Mon, 19 Jun 2017 23:17:19 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Abhiram Balasubramanian <abhiram@...utah.edu>,
        Eva Rachel Retuya <eraretuya@...il.com>,
        Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH 4.9 25/60] staging: iio: tsl2x7x_core: Fix standard deviation calculation

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eva Rachel Retuya <eraretuya@...il.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@...utah.edu>
Signed-off-by: Eva Rachel Retuya <eraretuya@...il.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);
 }
 
 /**