From 84b43284af40742abeb2cdd6998a4084866ba015 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 4 Sep 2020 18:27:27 +0200 Subject: ACPICA: Validate GPE blocks at init time Some of the checks done by acpi_hw_read() and acpi_hw_write(), which are used for accessing GPE registers, are redundant in the specific case of GPE registers and the ones that are not redundant can be done upfront at the initialization time so as to fail the initialization if they are not passed instead of failing every access to the affected GPE registers going forward (including accesses from the SCI interrupt handler). Modify the GPE blocks initialization code accordingly. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpica/hwvalid.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'drivers/acpi/acpica/hwvalid.c') diff --git a/drivers/acpi/acpica/hwvalid.c b/drivers/acpi/acpica/hwvalid.c index 4d94861e6093..b2ca7dfd3fc9 100644 --- a/drivers/acpi/acpica/hwvalid.c +++ b/drivers/acpi/acpica/hwvalid.c @@ -292,3 +292,33 @@ acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width) return (AE_OK); } + +/****************************************************************************** + * + * FUNCTION: acpi_hw_validate_io_block + * + * PARAMETERS: Address Address of I/O port/register blobk + * bit_width Number of bits (8,16,32) in each register + * count Number of registers in the block + * + * RETURN: Status + * + * DESCRIPTION: Validates a block of I/O ports/registers. + * + ******************************************************************************/ + +acpi_status acpi_hw_validate_io_block(u64 address, u32 bit_width, u32 count) +{ + acpi_status status; + + while (count--) { + status = acpi_hw_validate_io_request((acpi_io_address)address, + bit_width); + if (ACPI_FAILURE(status)) + return_ACPI_STATUS(status); + + address += ACPI_DIV_8(bit_width); + } + + return_ACPI_STATUS(AE_OK); +} -- cgit v1.2.3