[PATCH v4 17/23] ACPI: RISC-V: Create interrupt controller list in sorted order

[Anup Patel <apatel@ventanamicro.com>]

From: Sunil V L <sunilvl@ventanamicro.com>

Currently, the interrupt controller list is created without any order.
Create the list sorted with the GSI base of the interrupt controllers.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
 drivers/acpi/riscv/irq.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/riscv/irq.c b/drivers/acpi/riscv/irq.c
index cced960c2aef..95b4d7574ce3 100644
--- a/drivers/acpi/riscv/irq.c
+++ b/drivers/acpi/riscv/irq.c
@@ -115,7 +115,7 @@ struct fwnode_handle *riscv_acpi_get_gsi_domain_id(u32 gsi)
 static int __init riscv_acpi_register_ext_intc(u32 gsi_base, u32 nr_irqs, u32 nr_idcs,
 					       u32 id, u32 type)
 {
-	struct riscv_ext_intc_list *ext_intc_element;
+	struct riscv_ext_intc_list *ext_intc_element, *node;
 
 	ext_intc_element = kzalloc(sizeof(*ext_intc_element), GFP_KERNEL);
 	if (!ext_intc_element)
@@ -125,7 +125,17 @@ static int __init riscv_acpi_register_ext_intc(u32 gsi_base, u32 nr_irqs, u32 nr
 	ext_intc_element->nr_irqs = nr_irqs;
 	ext_intc_element->nr_idcs = nr_idcs;
 	ext_intc_element->id = id;
-	list_add_tail(&ext_intc_element->list, &ext_intc_list);
+	if (list_empty(&ext_intc_list)) {
+		list_add(&ext_intc_element->list, &ext_intc_list);
+		return 0;
+	}
+
+	list_for_each_entry(node, &ext_intc_list, list) {
+		if (node->gsi_base < ext_intc_element->gsi_base)
+			break;
+	}
+
+	__list_add(&ext_intc_element->list, node->list.prev, &node->list);
 	return 0;
 }
 
-- 
2.43.0