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authorTuan Phan <tuanphan@os.amperecomputing.com>2020-05-20 20:13:07 +0300
committerWill Deacon <will@kernel.org>2020-05-20 20:43:28 +0300
commit50c8ab8d9fbf5b18d5162a797ca26568afc0af1a (patch)
treeaa6897ad75bdc8bad4725f5954ab2785eecb7eba /drivers/acpi
parent701dafe0670c736c0131328c0fd64c1190f0bb0c (diff)
downloadlinux-50c8ab8d9fbf5b18d5162a797ca26568afc0af1a.tar.xz
ACPI/IORT: Fix PMCG node single ID mapping handling
An IORT PMCG node can have no ID mapping if its overflow interrupt is wire based therefore the code that parses the PMCG node can not assume the node will always have a single mapping present at index 0. Fix iort_get_id_mapping_index() by checking for an overflow interrupt and mapping count. Fixes: 24e516049360 ("ACPI/IORT: Add support for PMCG") Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com> Reviewed-by: Hanjun Guo <guoahanjun@huawei.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Link: https://lore.kernel.org/r/1589994787-28637-1-git-send-email-tuanphan@os.amperecomputing.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/arm64/iort.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 619a3e503346..9c40709c2f4e 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -388,6 +388,7 @@ 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:
@@ -415,6 +416,10 @@ 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 || node->mapping_count == 0)
+ return -EINVAL;
+
return 0;
default:
return -EINVAL;