diff options
Diffstat (limited to 'drivers/acpi/acpica')
| -rw-r--r-- | drivers/acpi/acpica/utosi.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/acpi/acpica/utosi.c b/drivers/acpi/acpica/utosi.c index 3f5fed670271..f0484b058c44 100644 --- a/drivers/acpi/acpica/utosi.c +++ b/drivers/acpi/acpica/utosi.c @@ -390,11 +390,22 @@ struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name) * PARAMETERS: walk_state - Current walk state * * RETURN: Status + * Integer: TRUE (0) if input string is matched + * FALSE (-1) if string is not matched * * DESCRIPTION: Implementation of the _OSI predefined control method. When * an invocation of _OSI is encountered in the system AML, * control is transferred to this function. * + * (August 2016) + * Note: _OSI is now defined to return "Ones" to indicate a match, for + * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones + * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF + * (ACPI_UINT64_MAX). + * + * This function always returns ACPI_UINT64_MAX for TRUE, and later code + * will truncate this to 32 bits if necessary. + * ******************************************************************************/ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state) @@ -404,7 +415,7 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state) struct acpi_interface_info *interface_info; acpi_interface_handler interface_handler; acpi_status status; - u32 return_value; + u64 return_value; ACPI_FUNCTION_TRACE(ut_osi_implementation); @@ -444,7 +455,7 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state) acpi_gbl_osi_data = interface_info->value; } - return_value = ACPI_UINT32_MAX; + return_value = ACPI_UINT64_MAX; } acpi_os_release_mutex(acpi_gbl_osi_mutex); @@ -456,9 +467,10 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state) */ interface_handler = acpi_gbl_interface_handler; if (interface_handler) { - return_value = - interface_handler(string_desc->string.pointer, - return_value); + if (interface_handler + (string_desc->string.pointer, (u32)return_value)) { + return_value = ACPI_UINT64_MAX; + } } ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, |