[PATCH v2 2/4] ACPI/APMT: Don't register invalid resource

[Robin Murphy]

Don't register a resource for the second page unless the dual-page
extension flag is actually present to say it's valid.

CC: Lorenzo Pieralisi <lpieralisi at kernel.org>
CC: Sudeep Holla <sudeep.holla at arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose at arm.com>
Reviewed-by: Hanjun Guo <guohanjun at huawei.com>
Reviewed-and-tested-by: Ilkka Koskinen <ilkka at os.amperecomputing.com>
Signed-off-by: Robin Murphy <robin.murphy at arm.com>
---
 drivers/acpi/arm64/apmt.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/arm64/apmt.c b/drivers/acpi/arm64/apmt.c
index 8cab69fa5d59..aa7d5c3c0dd8 100644
--- a/drivers/acpi/arm64/apmt.c
+++ b/drivers/acpi/arm64/apmt.c
@@ -35,11 +35,13 @@ static int __init apmt_init_resources(struct resource *res,
 
 	num_res++;
 
-	res[num_res].start = node->base_address1;
-	res[num_res].end = node->base_address1 + SZ_4K - 1;
-	res[num_res].flags = IORESOURCE_MEM;
+	if (node->flags & ACPI_APMT_FLAGS_DUAL_PAGE) {
+		res[num_res].start = node->base_address1;
+		res[num_res].end = node->base_address1 + SZ_4K - 1;
+		res[num_res].flags = IORESOURCE_MEM;
 
-	num_res++;
+		num_res++;
+	}
 
 	if (node->ovflw_irq != 0) {
 		trigger = (node->ovflw_irq_flags & ACPI_APMT_OVFLW_IRQ_FLAGS_MODE);
-- 
2.39.2.101.g768bb238c484.dirty