On Mon, Feb 6, 2023 at 9:49 PM Dave Jiang <dave.jiang@xxxxxxxxx> wrote:
>
> Export the CDAT checksum verify function so CXL driver can use it to verify
> CDAT coming from the CXL devices.
>
> Given that this function isn't actually being used by ACPI internals,
> removing the define check of APCI_CHECKSUM_ABORT so the function would
> return failure on checksum fail since the driver will need to know.
If you want to make ACPICA changes, please first submit a pull request
to the upstream ACPICA project on GitHub.
Having done that, please resubmit the corresponding Linux patch with a
Link tag pointing to the upstream PR.
Thanks!
> Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
> ---
> drivers/acpi/acpica/utcksum.c | 4 +---
> include/linux/acpi.h | 7 +++++++
> 2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/acpica/utcksum.c b/drivers/acpi/acpica/utcksum.c
> index c166e4c05ab6..c0f98c8f9a0b 100644
> --- a/drivers/acpi/acpica/utcksum.c
> +++ b/drivers/acpi/acpica/utcksum.c
> @@ -102,15 +102,13 @@ acpi_ut_verify_cdat_checksum(struct acpi_table_cdat *cdat_table, u32 length)
> "should be 0x%2.2X",
> acpi_gbl_CDAT, cdat_table->checksum,
> checksum));
> -
> -#if (ACPI_CHECKSUM_ABORT)
> return (AE_BAD_CHECKSUM);
> -#endif
> }
>
> cdat_table->checksum = checksum;
> return (AE_OK);
> }
> +EXPORT_SYMBOL_GPL(acpi_ut_verify_cdat_checksum);
>
> /*******************************************************************************
> *
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 5e6a876e17ba..09b44afef7df 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -1504,9 +1504,16 @@ static inline void acpi_init_ffh(void) { }
> #ifdef CONFIG_ACPI
> extern void acpi_device_notify(struct device *dev);
> extern void acpi_device_notify_remove(struct device *dev);
> +extern acpi_status
> +acpi_ut_verify_cdat_checksum(struct acpi_table_cdat *cdat_table, u32 length);
> #else
> static inline void acpi_device_notify(struct device *dev) { }
> static inline void acpi_device_notify_remove(struct device *dev) { }
> +static inline acpi_status
> +acpi_ut_verify_cdat_checksum(struct acpi_table_cdat *cdat_table, u32 length)
> +{
> + return (AE_NOT_CONFIGURED);
> +}
> #endif
>
> #endif /*_LINUX_ACPI_H*/
>
>
