It's reported that some buggy BIOS tables can contain 2 DSDT ECs and one of them is invalid. As we shouldn't evaluate _STA from acpi_ec_dsdt_probe() due to the unknown Windows enumeration order, this patch simply enhances sanity checks in ec_parse_device() as a workaround to skip probing wrong namespace ECs.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=195651 Tested-by: Daniel Drake <dr...@endlessm.com> Signed-off-by: Lv Zheng <lv.zh...@intel.com> --- drivers/acpi/ec.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index c24235d..a920db6 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -1362,6 +1362,14 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) ec_parse_io_ports, ec); if (ACPI_FAILURE(status)) return status; + /* + * It's better to evaluate _STA to determine if the device is + * valid. But that could potentially trigger issues related to + * the unknown orders of _INI/_STA evaluations. + * However we can abort due to invalid _CRS information here. + */ + if (ec->data_addr == 0 || ec->command_addr == 0) + return AE_OK; /* Get GPE bit assignment (EC events). */ /* TODO: Add support for _GPE returning a package */ -- 2.7.4
