From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Guenter Roeck <linux@roeck-us.net>,
Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk>,
Sasha Levin <sashal@kernel.org>,
linux-hwmon@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 190/251] hwmon: (lm75) Fix write operations for negative temperatures
Date: Thu, 16 Jan 2020 12:35:39 -0500 [thread overview]
Message-ID: <20200116173641.22137-150-sashal@kernel.org> (raw)
In-Reply-To: <20200116173641.22137-1-sashal@kernel.org>
From: Guenter Roeck <linux@roeck-us.net>
[ Upstream commit 7d82fcc9d9e81241778aaa22fda7be753e237d86 ]
Writes into limit registers fail if the temperature written is negative.
The regmap write operation checks the value range, regmap_write accepts
an unsigned int as parameter, and the temperature value passed to
regmap_write is kept in a variable declared as long. Negative values
are converted large unsigned integers, which fails the range check.
Fix by type casting the temperature to u16 when calling regmap_write().
Cc: Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk>
Fixes: e65365fed87f ("hwmon: (lm75) Convert to use regmap")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/hwmon/lm75.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index eff3b24d8473..fc31669a86ba 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -164,7 +164,7 @@ static int lm75_write(struct device *dev, enum hwmon_sensor_types type,
temp = DIV_ROUND_CLOSEST(temp << (resolution - 8),
1000) << (16 - resolution);
- return regmap_write(data->regmap, reg, temp);
+ return regmap_write(data->regmap, reg, (u16)temp);
}
static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,
--
2.20.1
next prev parent reply other threads:[~2020-01-16 18:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200116173641.22137-1-sashal@kernel.org>
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 115/251] hwmon: (w83627hf) Use request_muxed_region for Super-IO accesses Sasha Levin
2020-01-16 17:35 ` Sasha Levin [this message]
2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 199/251] hwmon: (shtc1) fix shtc1 and shtw1 id mask Sasha Levin
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