diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/ec.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index b4fd026c8229..3243e0801864 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -1668,12 +1668,26 @@ static const struct acpi_device_id ec_device_ids[] = { {"", 0}, }; +/* + * This function is not Windows-compatible as Windows never enumerates the + * namespace EC before the main ACPI device enumeration process. It is + * retained for historical reason and will be deprecated in the future. + */ int __init acpi_ec_dsdt_probe(void) { acpi_status status; struct acpi_ec *ec; int ret; + /* + * If a platform has ECDT, there is no need to proceed as the + * following probe is not a part of the ACPI device enumeration, + * executing _STA is not safe, and thus this probe may risk of + * picking up an invalid EC device. + */ + if (boot_ec) + return -ENODEV; + ec = acpi_ec_alloc(); if (!ec) return -ENOMEM; |