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| author | Arnd Bergmann <arnd@arndb.de> | 2024-10-30 12:36:41 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-11-05 21:41:10 +0100 |
| commit | 4435a125015d3c3d4494a3f4307d23f15d6cb42b (patch) | |
| tree | 2939c98dec999238d167727d5439df2407e349d8 /drivers/acpi | |
| parent | 59b723cd2adbac2a34fc8e12c74ae26ae45bf230 (diff) | |
| download | lwn-4435a125015d3c3d4494a3f4307d23f15d6cb42b.tar.gz lwn-4435a125015d3c3d4494a3f4307d23f15d6cb42b.zip | |
ACPI: allow building without CONFIG_HAS_IOPORT
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>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/cppc_acpi.c | 6 | ||||
| -rw-r--r-- | drivers/acpi/osl.c | 12 |
2 files changed, 16 insertions, 2 deletions
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 1a40f0514eaa..3757424b715f 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -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, diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 70af3fbbebe5..fed446aace42 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -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) { |