From: Tuan Phan <tuanphan@os.amperecomputing.com>
To: patches@amperecomputing.com
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Hanjun Guo <guohanjun@huawei.com>,
Sudeep Holla <sudeep.holla@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] ACPI/IORT: Fix PMCG node always look for a single ID mapping.
Date: Mon, 11 May 2020 13:22:56 -0700 [thread overview]
Message-ID: <1589228576-18053-1-git-send-email-tuanphan@os.amperecomputing.com> (raw)
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>
---
drivers/acpi/arm64/iort.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index ed3d2d1..72444e1 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -441,7 +441,9 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node)
return smmu->id_mapping_index;
case ACPI_IORT_NODE_PMCG:
- return 0;
+ if (node->mapping_count)
+ return 0;
+ return -EINVAL;
default:
return -EINVAL;
}
--
2.7.4
next reply other threads:[~2020-05-11 20:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-11 20:22 Tuan Phan [this message]
2020-05-12 10:40 ` [PATCH] ACPI/IORT: Fix PMCG node always look for a single ID mapping Lorenzo Pieralisi
2020-05-12 23:53 ` Tuan Phan
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