On Fri, Jun 14, 2013 at 11:47:21PM +0530, Naveen N. Rao wrote:
> +static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
> +{
> + int i;
> + struct acpi_hest_ia_corrected *cmc;
> + struct acpi_hest_ia_error_bank *mc_bank;
> +
> + if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
> + return 0;
> +
> + if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
> + return 0;
> +
> + cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
> + if (!(cmc->flags & ACPI_HEST_FIRMWARE_FIRST))
> + return 0;
> +
> + /*
> + * We expect HEST to provide a list of MC banks that
> + * report errors through firmware first mode.
> + */
> + if (cmc->num_hardware_banks <= 0)
> + return 0;
> +
> + pr_info("HEST: Enabling Firmware First mode for corrected errors\n");
> +
> + mc_bank = (struct acpi_hest_ia_error_bank *)(cmc + 1);
> + for (i = 0; i < cmc->num_hardware_banks; i++, mc_bank++)
> + mce_disable_bank(mc_bank->bank_number);
One more thing: we never trust the BIOS so mce_disable_bank() should
sanity-check this mc_bank->bank_number against the number of the
actually available banks on the system before disabling anything.
Thanks.
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