linux-kernel - [RESEND PATCH 3/8] thermal: rockchip: fix a impossible condition caused by the warning

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Date:	Mon, 15 Feb 2016 15:33:28 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>, edubezval@...il.com
Cc:	huangtao@...k-chips.com,
	Michael Turquette <mturquette@...libre.com>,
	linux-pm@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>,
	zhangqing@...k-chips.com, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jeffy Chen <jeffy.chen@...k-chips.com>,
	Zhang Rui <rui.zhang@...el.com>, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Caesar Wang <wxt@...k-chips.com>
Subject: [RESEND PATCH 3/8] 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>
---

 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 b58e3fb..433085a 100644
--- a/drivers/thermal/rockchip_thermal.c
+++ b/drivers/thermal/rockchip_thermal.c
@@ -693,15 +693,14 @@ 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