diff options
Diffstat (limited to 'drivers/acpi/acpica/tbutils.c')
| -rw-r--r-- | drivers/acpi/acpica/tbutils.c | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c index 5a968a78652b..0c6768d20395 100644 --- a/drivers/acpi/acpica/tbutils.c +++ b/drivers/acpi/acpica/tbutils.c @@ -141,9 +141,9 @@ void acpi_tb_check_dsdt_header(void) * * FUNCTION: acpi_tb_copy_dsdt * - * PARAMETERS: table_desc - Installed table to copy + * PARAMETERS: table_index - Index of installed table to copy * - * RETURN: None + * RETURN: The copied DSDT * * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. * Some very bad BIOSs are known to either corrupt the DSDT or @@ -239,7 +239,7 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) * * FUNCTION: acpi_tb_parse_root_table * - * PARAMETERS: rsdp - Pointer to the RSDP + * PARAMETERS: rsdp_address - Pointer to the RSDP * * RETURN: Status * @@ -416,13 +416,18 @@ acpi_tb_get_table(struct acpi_table_desc *table_desc, } } - table_desc->validation_count++; - if (table_desc->validation_count == 0) { - ACPI_ERROR((AE_INFO, - "Table %p, Validation count is zero after increment\n", - table_desc)); - table_desc->validation_count--; - return_ACPI_STATUS(AE_LIMIT); + if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) { + table_desc->validation_count++; + + /* + * Detect validation_count overflows to ensure that the warning + * message will only be printed once. + */ + if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) { + ACPI_WARNING((AE_INFO, + "Table %p, Validation count overflows\n", + table_desc)); + } } *out_table = table_desc->pointer; @@ -449,13 +454,20 @@ void acpi_tb_put_table(struct acpi_table_desc *table_desc) ACPI_FUNCTION_TRACE(acpi_tb_put_table); - if (table_desc->validation_count == 0) { - ACPI_WARNING((AE_INFO, - "Table %p, Validation count is zero before decrement\n", - table_desc)); - return_VOID; + if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) { + table_desc->validation_count--; + + /* + * Detect validation_count underflows to ensure that the warning + * message will only be printed once. + */ + if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) { + ACPI_WARNING((AE_INFO, + "Table %p, Validation count underflows\n", + table_desc)); + return_VOID; + } } - table_desc->validation_count--; if (table_desc->validation_count == 0) { |