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SubjectRe: [PATCH] acpi: apei: check for pending errors when probing HED type GHES entries
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On 3/28/2017 4:00 PM, Al Stone wrote:
> On 03/28/2017 02:14 PM, Tyler Baicar wrote:
>> If a HED type error occurs prior to GHES probing, the kernel will
>> never report the error. The HED driver will see that no notifiers
>> are registers, and clear the interrupt.
> ..."registers" or "registered"?
Oops :) I'll fix that to say registered.

Thanks,
Tyler
>
>> This becomes a more serious problem with firmware that supports
>> GHESv2 acknowledgements from the kernel. The firmware will populate
>> the error and wait for the kernel ack. But since the kernel will
>> never process the error we get into a state that the firmware will
>> not send any more errors and the kernel will never see or ack the
>> original error.
>>
>> Check for pending errors when probing HED type GHES entries to
>> avoid the above situation.
>>
>> This patch is based on Shiju's patch that adds support for GSIV
>> and GPIO notification types:
>> https://patchwork.kernel.org/patch/9628817/
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> ---
>> drivers/acpi/apei/ghes.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index fd39929..cf5e938 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -1035,6 +1035,7 @@ static int ghes_probe(struct platform_device *ghes_dev)
>> register_acpi_hed_notifier(&ghes_notifier_hed);
>> list_add_rcu(&ghes->list, &ghes_hed);
>> mutex_unlock(&ghes_list_mutex);
>> + ghes_proc(ghes);
>> break;
>> case ACPI_HEST_NOTIFY_NMI:
>> ghes_nmi_add(ghes);
>>
>

--
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

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