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hwmon: (tps23861) Fix reporting of negative temperatures

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BugLink: https://bugs.launchpad.net/bugs/2101915

[ Upstream commit de2bf507fabba9c0c678cf5ed54beb546f5ca29a ]

Negative temperatures are reported as large positive temperatures
due to missing sign extension from unsigned int to long. Cast unsigned
raw register values to signed before performing the calculations
to fix the problem.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: fff7b8ab22 ("hwmon: add Texas Instruments TPS23861 driver")
Signed-off-by: Murad Masimov <m.masimov@maxima.ru>
Message-ID: <20241121173604.2021-1-m.masimov@maxima.ru>
[groeck: Updated subject and description]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Murad Masimov
2025-03-11 08:51:19 +09:00
committed by Stefan Bader
parent 2705830f94
commit 9302f0df63
1 changed files with 1 additions and 1 deletions
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drivers/hwmon/tps23861.c
+1 -1
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@@ -132,7 +132,7 @@ static int tps23861_read_temp(struct tps23861_data *data, long *val)
if (err < 0)
return err;
*val = (regval * TEMPERATURE_LSB) - 20000;
*val = ((long)regval * TEMPERATURE_LSB) - 20000;
return 0;
}