Commit 49fbabf5 authored by Zhao Yakui's avatar Zhao Yakui Committed by Len Brown
Browse files

ACPI: Handle I/O access width requestst that are not a multiple of 8 bits. 



We've run into BIOS that hand us 4-bit access width requests
for T-state control when the code expected only multipls of 8-bits.
Round up.

Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarLi Shaohua <shaohua.li@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent ef54d5ad

drivers/acpi/osl.c

+9 −16
Original line number Diff line number Diff line
@@ -387,17 +387,14 @@ acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) 
	if (!value)

		value = &dummy;



	switch (width) {

	case 8:

	*value = 0;

	if (width <= 8) {

		*(u8 *) value = inb(port);

		break;

	case 16:

	} else if (width <= 16) {

		*(u16 *) value = inw(port);

		break;

	case 32:

	} else if (width <= 32) {

		*(u32 *) value = inl(port);

		break;

	default:

	} else {

		BUG();

	}
@@ -408,17 +405,13 @@ EXPORT_SYMBOL(acpi_os_read_port); 


acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)

{

	switch (width) {

	case 8:

	if (width <= 8) {

		outb(value, port);

		break;

	case 16:

	} else if (width <= 16) {

		outw(value, port);

		break;

	case 32:

	} else if (width <= 32) {

		outl(value, port);

		break;

	default:

	} else {

		BUG();

	}