diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-01-12 19:26:32 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-01-17 19:38:55 +0100 |
| commit | 5f51c7ce1dc36565296b3ef342585f70ec72a2a9 (patch) | |
| tree | 94237e2e4dded2d0a64cfef60ee01d6d903bbcaa /drivers/acpi/cppc_acpi.c | |
| parent | b35b6d4d71365fbfb6f2cc8edc331b3882ca817e (diff) | |
ACPI: CPPC: Fix up I/O port access in cpc_read()
The code as currently implemented does not work on big endian systems,
so fix it up.
Fixes: a2c8f92bea5f ("ACPI: CPPC: Implement support for SystemIO registers")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/linux-acpi/20220111092928.GA24968@kili/
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Diffstat (limited to 'drivers/acpi/cppc_acpi.c')
| -rw-r--r-- | drivers/acpi/cppc_acpi.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index a9d2de403c0c..5bc55322e425 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -929,16 +929,18 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { u32 width = 8 << (reg->access_width - 1); + u32 val_u32; acpi_status status; status = acpi_os_read_port((acpi_io_address)reg->address, - (u32 *)val, width); + &val_u32, width); if (ACPI_FAILURE(status)) { pr_debug("Error: Failed to read SystemIO port %llx\n", reg->address); return -EFAULT; } + *val = val_u32; return 0; } else if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM && pcc_ss_id >= 0) vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); |