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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);
}
/**
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