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ACPI / EC: Enhance boot EC sanity check

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It's reported that some buggy BIOS tables can contain 2 DSDT ECs, one of
them is invalid but acpi_ec_dsdt_probe() fails to pick the valid one.
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 <[email protected]>
Signed-off-by: Lv Zheng <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Lv Zheng 2017-06-15 09:41:35 +08:00 • committed by Rafael J. Wysocki
commit ae56c9fd15
1 changed files with 2 additions and 0 deletions
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2
drivers/acpi/ec.c
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@ -1363,6 +1363,8 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
ec_parse_io_ports, ec);
if (ACPI_FAILURE(status))
return status;
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 */