linux-kernel - [PATCH v4 2/5] thermal: rockchip: fix a impossible condition caused by the warning

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Message-Id: <1450602405-20883-1-git-send-email-wxt@rock-chips.com>
Date:	Sun, 20 Dec 2015 17:06:45 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	edubezval@...il.com
Cc:	heiko@...ech.de, dmitry.torokhov@...il.com,
	computersforpeace@...il.com, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-pm@...r.kernel.org, rui.zhang@...el.com,
	Caesar Wang <wxt@...k-chips.com>
Subject: [PATCH v4 2/5] thermal: rockchip: fix a impossible condition caused by the warning

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>

---

Changes in v4:
- As the Dmitry and Brain comments, let's change to make.sh
  tshut_temp instead of thermal->tshut_temp.

Changes in v3:
- As Brian comments on https://patchwork.kernel.org/patch/7580661/,
  let's remove the impossible condition.

Changes in v2:
- None

Changes in v1:
- None

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

diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
index e845841..7106288 100644
--- a/drivers/thermal/rockchip_thermal.c
+++ b/drivers/thermal/rockchip_thermal.c
@@ -545,15 +545,14 @@ static int rockchip_configure_from_dt(struct device *dev,
 			 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",
-- 
1.9.1

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