linux-kernel - [PATCH] hwmon: (ads1015) Handle negative conversion values correctly

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Message-Id: <1455800872-24431-1-git-send-email-peda@lysator.liu.se>
Date:	Thu, 18 Feb 2016 14:07:52 +0100
From:	Peter Rosin <peda@...ator.liu.se>
To:	Dirk Eibach <eibach@...ys.de>
Cc:	Peter Rosin <peda@...ntia.se>, Jean Delvare <jdelvare@...e.de>,
	Guenter Roeck <linux@...ck-us.net>, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Peter Rosin <peda@...ator.liu.se>
Subject: [PATCH] hwmon: (ads1015) Handle negative conversion values correctly

From: Peter Rosin <peda@...ntia.se>

Make the divisor signed as DIV_ROUND_CLOSEST is undefined for negative
dividends when the divisor is unsigned.

Signed-off-by: Peter Rosin <peda@...ntia.se>
---
 drivers/hwmon/ads1015.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/ads1015.c b/drivers/hwmon/ads1015.c
index f155b8380481..2b3105c8aed3 100644
--- a/drivers/hwmon/ads1015.c
+++ b/drivers/hwmon/ads1015.c
@@ -126,7 +126,7 @@ static int ads1015_reg_to_mv(struct i2c_client *client, unsigned int channel,
 	struct ads1015_data *data = i2c_get_clientdata(client);
 	unsigned int pga = data->channel_data[channel].pga;
 	int fullscale = fullscale_table[pga];
-	const unsigned mask = data->id == ads1115 ? 0x7fff : 0x7ff0;
+	const int mask = data->id == ads1115 ? 0x7fff : 0x7ff0;
 
 	return DIV_ROUND_CLOSEST(reg * fullscale, mask);
 }
-- 
2.1.4