linux-kernel - [PATCH 4.4 159/163] thermal: rockchip: fix a impossible condition caused by the warning

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Date:	Mon,  2 May 2016 17:13:07 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
	Caesar Wang <wxt@...k-chips.com>,
	Eduardo Valentin <edubezval@...il.com>
Subject: [PATCH 4.4 159/163] thermal: rockchip: fix a impossible condition caused by the warning

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

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

From: Caesar Wang <wxt@...k-chips.com>

commit 43b4eb9fe719b107c8e5d49d1edbff0c135a42cb upstream.

As the Dan report the smatch check the thermal driver warning:
drivers/thermal/rockchip_thermal.c:551 rockchip_configure_from_dt()
warn: impossible condition '(thermal->tshut_temp > ((~0 >> 1))) =>
(s32min-s32max > s32max)'

Although The shut_temp read from DT is u32,the temperature is currently
represented as int not long in the thermal driver.
Let's change to make shut_temp instead of the thermal->tshut_temp for
the condition.

Fixes: commit 437df2172e8d
("thermal: rockchip: consistently use int for temperatures")

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Caesar Wang <wxt@...k-chips.com>
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/thermal/rockchip_thermal.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/drivers/thermal/rockchip_thermal.c
+++ b/drivers/thermal/rockchip_thermal.c
@@ -545,15 +545,14 @@ static int rockchip_configure_from_dt(st
 			 thermal->chip->tshut_temp);
 		thermal->tshut_temp = thermal->chip->tshut_temp;
 	} else {
+		if (shut_temp > INT_MAX) {
+			dev_err(dev, "Invalid tshut temperature specified: %d\n",
+				shut_temp);
+			return -ERANGE;
+		}
 		thermal->tshut_temp = shut_temp;
 	}
 
-	if (thermal->tshut_temp > INT_MAX) {
-		dev_err(dev, "Invalid tshut temperature specified: %d\n",
-			thermal->tshut_temp);
-		return -ERANGE;
-	}
-
 	if (of_property_read_u32(np, "rockchip,hw-tshut-mode", &tshut_mode)) {
 		dev_warn(dev,
 			 "Missing tshut mode property, using default (%s)\n",