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SubjectRe: [PATCH v2] ACPI/IORT: Fix PMCG node always look for a single ID mapping.
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On 2020/5/13 7:56, Tuan Phan wrote:
> PMCG node can have zero ID mapping if its overflow interrupt
> is wire based. The code to parse PMCG node can not assume it will
> have a single ID mapping.
>
> Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>

It's better to add

Fixes: 24e516049360 ("ACPI/IORT: Add support for PMCG")

> ---
> Changes in v2:
> - Used pmcg node to detect wired base overflow interrupt.
>
> drivers/acpi/arm64/iort.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index ed3d2d1..11a4e8e 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -414,6 +414,7 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
> static int iort_get_id_mapping_index(struct acpi_iort_node *node)
> {
> struct acpi_iort_smmu_v3 *smmu;
> + struct acpi_iort_pmcg *pmcg;
>
> switch (node->type) {
> case ACPI_IORT_NODE_SMMU_V3:
> @@ -441,6 +442,10 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node)
>
> return smmu->id_mapping_index;
> case ACPI_IORT_NODE_PMCG:
> + pmcg = (struct acpi_iort_pmcg *)node->node_data;
> + if (pmcg->overflow_gsiv)
> + return -EINVAL;
> +
> return 0;
> default:
> return -EINVAL;

With my comments addressed,

Reviewed-by: Hanjun Guo <guoahanjun@huawei.com>

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