ACPI/APMT: Don't register invalid resource

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 <[email protected]>
CC: Sudeep Holla <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Reviewed-by: Hanjun Guo <[email protected]>
Reviewed-and-tested-by: Ilkka Koskinen <[email protected]>
Signed-off-by: Robin Murphy <[email protected]>
Acked-by: Lorenzo Pieralisi <[email protected]>
Link: https://lore.kernel.org/r/63b34656e1f7b41bcb458fb6d7496e04db757e0d.1685983270.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <[email protected]>

Author: rmurphy-arm

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);