From: Nadav Haklai <nadavh@marvell.com>
Date: Thu, 6 Aug 2015 16:03:49 +0000 (+0200)
Subject: thermal: armada: Fix possible overflow in the Armada 380 thermal sensor formula
X-Git-Tag: v4.4-rc1~38^2^3~1^2~1
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=b56100db5b057fef889a73cb66c24633696d188b;p=linux.git

thermal: armada: Fix possible overflow in the Armada 380 thermal sensor formula

Update the coefficients so the calculation will not overrun the
unsigned long 32bits boundary

Signed-off-by: Nadav Haklai <nadavh@marvell.com>
Reviewed-by: Victor Axelrod <victora@marvell.com>
Reviewed-by: Neta Zur Hershkovits <neta@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
---

diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
index 26b8d326546a..ae75328945f7 100644
--- a/drivers/thermal/armada_thermal.c
+++ b/drivers/thermal/armada_thermal.c
@@ -224,9 +224,9 @@ static const struct armada_thermal_data armada380_data = {
 	.is_valid_shift = 10,
 	.temp_shift = 0,
 	.temp_mask = 0x3ff,
-	.coef_b = 2931108200UL,
-	.coef_m = 5000000UL,
-	.coef_div = 10502,
+	.coef_b = 1172499100UL,
+	.coef_m = 2000096UL,
+	.coef_div = 4201,
 	.inverted = true,
 };