[PATCH 21/36] irqchip/mbigen: move to use bus_get_dev_root()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

Direct access to the struct bus_type dev_root pointer is going away soon
so replace that with a call to bus_get_dev_root() instead, which is what
it is there for.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Note, this is a patch that is a prepatory cleanup as part of a larger
series of patches that is working on resolving some old driver core
design mistakes.  It will build and apply cleanly on top of 6.3-rc2 on
its own, but I'd prefer if I could take it through my driver-core tree
so that the driver core changes can be taken through there for 6.4-rc1.

 drivers/irqchip/irq-mbigen.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index f3faf5c99770..30ca1bf7fc8b 100644
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -245,11 +245,14 @@ static int mbigen_of_create_domain(struct platform_device *pdev,
 		if (!of_property_read_bool(np, "interrupt-controller"))
 			continue;
 
-		parent = platform_bus_type.dev_root;
-		child = of_platform_device_create(np, NULL, parent);
-		if (!child) {
-			of_node_put(np);
-			return -ENOMEM;
+		parent = bus_get_dev_root(&platform_bus_type);
+		if (parent) {
+			child = of_platform_device_create(np, NULL, parent);
+			put_device(parent);
+			if (!child) {
+				of_node_put(np);
+				return -ENOMEM;
+			}
 		}
 
 		if (of_property_read_u32(child->dev.of_node, "num-pins",
-- 
2.39.2