[PATCH v2 10/10] irqchip/gic-v5: Release ITS MMIO region on DT probe failure

[Sascha Bischoff <sascha.bischoff@arm.com>]

of_io_request_and_map() reserves the ITS configuration frame region.
If ITS initialisation fails after mapping it, the error path only
unmaps the registers and leaves the region reserved.

Keep the resource description and release the region on that path.

Fixes: 57d72196dfc85 ("irqchip/gic-v5: Add GICv5 ITS support")
Acked-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
---
 drivers/irqchip/irq-gic-v5-its.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v5-its.c b/drivers/irqchip/irq-gic-v5-its.c
index aebab9f306476..101aceec68f63 100644
--- a/drivers/irqchip/irq-gic-v5-its.c
+++ b/drivers/irqchip/irq-gic-v5-its.c
@@ -1188,6 +1188,7 @@ static int __init gicv5_its_init_bases(void __iomem *its_base, struct fwnode_han
 static int __init gicv5_its_init(struct device_node *node)
 {
 	void __iomem *its_base;
+	struct resource res;
 	int ret, idx;
 
 	idx = of_property_match_string(node, "reg-names", "ns-config");
@@ -1196,6 +1197,11 @@ static int __init gicv5_its_init(struct device_node *node)
 		return -ENODEV;
 	}
 
+	/* Save the region to release if ITS setup fails after mapping it. */
+	ret = of_address_to_resource(node, idx, &res);
+	if (ret)
+		return ret;
+
 	its_base = of_io_request_and_map(node, idx, of_node_full_name(node));
 	if (IS_ERR(its_base)) {
 		pr_err("%pOF: unable to map GICv5 ITS_CONFIG_FRAME\n", node);
@@ -1212,6 +1218,7 @@ static int __init gicv5_its_init(struct device_node *node)
 
 out_unmap:
 	iounmap(its_base);
+	release_mem_region(res.start, resource_size(&res));
 	return ret;
 }
 

-- 
2.34.1