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hwmon: (pt5161l) Fix invalid temperature reading

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The temperature reading function was using a signed long for the ADC
code, which could lead to mishandling of invalid codes on 32-bit
platforms. This allowed out-of-range ADC codes to be incorrectly
interpreted as valid values and used in temperature calculations.

Change adc_code to u32 to ensure that invalid ADC codes are correctly
identified on all platforms.

Fixes: 1b2ca93cd0 ("hwmon: Add driver for Astera Labs PT5161L retimer")
Signed-off-by: Cosmo Chou <chou.cosmo@gmail.com>
Message-ID: <20240819104630.2375441-1-chou.cosmo@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Cosmo Chou 2024-08-19 18:46:30 +08:00 committed by Guenter Roeck
parent 9efaebc007
commit 7bbc079531
1 changed files with 2 additions and 2 deletions
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4
drivers/hwmon/pt5161l.c
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@ -427,7 +427,7 @@ static int pt5161l_read(struct device *dev, enum hwmon_sensor_types type,
struct pt5161l_data *data = dev_get_drvdata(dev);
int ret;
u8 buf[8];
long adc_code;
u32 adc_code;
switch (attr) {
case hwmon_temp_input:
@ -449,7 +449,7 @@ static int pt5161l_read(struct device *dev, enum hwmon_sensor_types type,
adc_code = buf[3] << 24 | buf[2] << 16 | buf[1] << 8 | buf[0];
if (adc_code == 0 || adc_code >= 0x3ff) {
dev_dbg(dev, "Invalid adc_code %lx\n", adc_code);
dev_dbg(dev, "Invalid adc_code %x\n", adc_code);
return -EIO;
}