hwmon: (acpi_power_meter) Fix fail to load module on platform without _PMD method

LiHuiSong1 · groeck · commit fabb1f813ec0 · 2024-11-12T13:54:55.000-08:00
According to the ACPI specification, the _PMD method is optional. The
acpi_power_meter driver shouldn't fail to load if the platform has no
_PMD method.

Signed-off-by: Huisong Li &lt;lihuisong@huawei.com&gt;
Message-ID: &lt;20241112021228.22914-1-lihuisong@huawei.com&gt;
[groeck: Reworded commit description]
Signed-off-by: Guenter Roeck &lt;linux@roeck-us.net&gt;
diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
@@ -680,8 +680,9 @@ static int setup_attrs(struct acpi_power_meter_resource *resource)
 {
 	int res = 0;
 
+	/* _PMD method is optional. */
 	res = read_domain_devices(resource);
-	if (res)
+	if (res != -ENODEV)
 		return res;
 
 	if (resource->caps.flags & POWER_METER_CAN_MEASURE) {

Original file line number	Diff line number	Diff line change
`@@ -680,8 +680,9 @@ static int setup_attrs(struct acpi_power_meter_resource *resource)`
`680`	`680`	`{`
`681`	`681`	`int res = 0;`
`682`	`682`
	`683`	`+ /* _PMD method is optional. */`
`683`	`684`	`res = read_domain_devices(resource);`
`684`		`- if (res)`
	`685`	`+ if (res != -ENODEV)`
`685`	`686`	`return res;`
`686`	`687`
`687`	`688`	`if (resource->caps.flags & POWER_METER_CAN_MEASURE) {`