This is a note to let you know that I've just added the patch titled hwmon: (f71882fg) Fix negative temperature to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: hwmon-f71882fg-fix-negative-temperature.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 594e31432965524599dc8579ebd2021692502bb4 Author: Ji-Ze Hong (Peter Hong) <hpeter@xxxxxxxxx> Date: Mon Apr 18 17:07:06 2022 +0800 hwmon: (f71882fg) Fix negative temperature [ Upstream commit 4aaaaf0f279836f06d3b9d0ffeec7a1e1a04ceef ] All temperature of Fintek superio hwmonitor that using 1-byte reg will use 2's complement. In show_temp() temp = data->temp[nr] * 1000; When data->temp[nr] read as 255, it indicate -1C, but this code will report 255C to userspace. It'll be ok when change to: temp = ((s8)data->temp[nr]) * 1000; Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@xxxxxxxxx> Link: https://lore.kernel.org/r/20220418090706.6339-1-hpeter+linux_kernel@xxxxxxxxx Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/hwmon/f71882fg.c b/drivers/hwmon/f71882fg.c index d09deb409de7..3336ff9e306b 100644 --- a/drivers/hwmon/f71882fg.c +++ b/drivers/hwmon/f71882fg.c @@ -1577,8 +1577,9 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, temp *= 125; if (sign) temp -= 128000; - } else - temp = data->temp[nr] * 1000; + } else { + temp = ((s8)data->temp[nr]) * 1000; + } return sprintf(buf, "%d\n", temp); }