From: Armin Wolf W_Armin@gmx.de
stable inclusion from stable-v6.6.7 commit 8ebf05908f0e8ab5d2c50555ed059fa239b31072 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8SSQ4
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 1fefca6c57fb928d2131ff365270cbf863d89c88 ]
The ACPI specification says:
"If an error occurs while obtaining the meter reading or if the value is not available then an Integer with all bits set is returned"
Since the "integer" is 32 bits in case of the ACPI power meter, userspace will get a power reading of 2^32 * 1000 miliwatts (~4.29 MW) in case of such an error. This was discovered due to a lm_sensors bugreport (https://github.com/lm-sensors/lm-sensors/issues/460). Fix this by returning -ENODATA instead.
Tested-by: urbinek@gmail.com Fixes: de584afa5e18 ("hwmon driver for ACPI 4.0 power meters") Signed-off-by: Armin Wolf W_Armin@gmx.de Link: https://lore.kernel.org/r/20231124182747.13956-1-W_Armin@gmx.de Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/hwmon/acpi_power_meter.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c index fa28d447f0df..b772c076a5ae 100644 --- a/drivers/hwmon/acpi_power_meter.c +++ b/drivers/hwmon/acpi_power_meter.c @@ -31,6 +31,7 @@ #define POWER_METER_CAN_NOTIFY (1 << 3) #define POWER_METER_IS_BATTERY (1 << 8) #define UNKNOWN_HYSTERESIS 0xFFFFFFFF +#define UNKNOWN_POWER 0xFFFFFFFF
#define METER_NOTIFY_CONFIG 0x80 #define METER_NOTIFY_TRIP 0x81 @@ -348,6 +349,9 @@ static ssize_t show_power(struct device *dev, update_meter(resource); mutex_unlock(&resource->lock);
+ if (resource->power == UNKNOWN_POWER) + return -ENODATA; + return sprintf(buf, "%llu\n", resource->power * 1000); }