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ACPI: allow building without CONFIG_HAS_IOPORT

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CONFIG_HAS_IOPORT will soon become optional and cause a build time
failure when it is disabled but a driver calls inb()/outb(). At the
moment, all architectures that can support ACPI have port I/O, but this
is not necessarily the case in the future on non-x86 architectures.
The result is a set of errors like:

drivers/acpi/osl.c: In function 'acpi_os_read_port':
include/asm-generic/io.h:542:14: error: call to '_inb' declared with attribute error: inb()) requires CONFIG_HAS_IOPORT

Nothing should actually call these functions in this configuration,
and if it does, the result would be undefined behavior today, possibly
a NULL pointer dereference.

Change the low-level functions to return a proper error code when
HAS_IOPORT is disabled.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20241030123701.1538919-2-arnd@kernel.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Arnd Bergmann 2024-10-30 12:36:41 +00:00 committed by Rafael J. Wysocki
parent 59b723cd2a
commit 4435a12501
2 changed files with 16 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/acpi/cppc_acpi.c
View File

@ -1017,7 +1017,8 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
*val = 0;
size = GET_BIT_WIDTH(reg);
if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
if (IS_ENABLED(CONFIG_HAS_IOPORT) &&
reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
u32 val_u32;
acpi_status status;
@ -1091,7 +1092,8 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
size = GET_BIT_WIDTH(reg);
if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
if (IS_ENABLED(CONFIG_HAS_IOPORT) &&
reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
acpi_status status;
status = acpi_os_write_port((acpi_io_address)reg->address,

12
drivers/acpi/osl.c
View File

@ -642,6 +642,15 @@ acpi_status acpi_os_read_port(acpi_io_address port, u32 *value, u32 width)
{
u32 dummy;
if (!IS_ENABLED(CONFIG_HAS_IOPORT)) {
/*
* set all-1 result as if reading from non-existing
* I/O port
*/
*value = GENMASK(width, 0);
return AE_NOT_IMPLEMENTED;
}
if (value)
*value = 0;
else
@ -665,6 +674,9 @@ EXPORT_SYMBOL(acpi_os_read_port);
acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
{
if (!IS_ENABLED(CONFIG_HAS_IOPORT))
return AE_NOT_IMPLEMENTED;
if (width <= 8) {
outb(value, port);
} else if (width <= 16) {