On Tuesday, February 14, 2017 10:01:13 AM Huang, Ying wrote:
> From: Huang Ying <ying.huang@xxxxxxxxx>
>
> It was reported that some firmware will use ACPI NVS area for BERT
> address range. This will cause resources conflict because the ACPI
> NVS area is marked as busy already. Fix this via excluding ACPI NVS
> area when requesting IO resources for BERT.
>
> Reported-and-tested-by: Hans Kristian Rosbach <hansr@xxxxxxxxxxxxx>
> Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Boris, what do you think?
> ---
> drivers/acpi/apei/bert.c | 20 ++++++++++++--------
> 1 file changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/acpi/apei/bert.c b/drivers/acpi/apei/bert.c
> index a05b5c0cf181..12771fcf0417 100644
> --- a/drivers/acpi/apei/bert.c
> +++ b/drivers/acpi/apei/bert.c
> @@ -97,6 +97,7 @@ static int __init bert_check_table(struct acpi_table_bert *bert_tab)
>
> static int __init bert_init(void)
> {
> + struct apei_resources bert_resources;
> struct acpi_bert_region *boot_error_region;
> struct acpi_table_bert *bert_tab;
> unsigned int region_len;
> @@ -127,13 +128,14 @@ static int __init bert_init(void)
> }
>
> region_len = bert_tab->region_length;
> - if (!request_mem_region(bert_tab->address, region_len, "APEI BERT")) {
> - pr_err("Can't request iomem region <%016llx-%016llx>.\n",
> - (unsigned long long)bert_tab->address,
> - (unsigned long long)bert_tab->address + region_len - 1);
> - return -EIO;
> - }
> -
> + apei_resources_init(&bert_resources);
> + rc = apei_resources_add(&bert_resources, bert_tab->address,
> + region_len, true);
> + if (rc)
> + return rc;
> + rc = apei_resources_request(&bert_resources, "APEI BERT");
> + if (rc)
> + goto out_fini;
> boot_error_region = ioremap_cache(bert_tab->address, region_len);
> if (boot_error_region) {
> bert_print_all(boot_error_region, region_len);
> @@ -142,7 +144,9 @@ static int __init bert_init(void)
> rc = -ENOMEM;
> }
>
> - release_mem_region(bert_tab->address, region_len);
> + apei_resources_release(&bert_resources);
> +out_fini:
> + apei_resources_fini(&bert_resources);
>
> return rc;
> }
>
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