6.7-stable review patch. If anyone has any objections, please let me know.
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From: Chen Jun chenjun102@huawei.com
commit fb33a46cd75e18773dd5a414744507d84ae90870 upstream.
bus_get_dev_root() returns sp->dev_root which is set in subsys_register(), but subsys_register() is not called by platform_bus_init().
Therefor for the platform_bus_type, bus_get_dev_root() always returns NULL. This makes mbigen_of_create_domain() always return -ENODEV.
Don't try to retrieve the parent via bus_get_dev_root() and unconditionally hand a NULL pointer to of_platform_device_create() to fix this.
Fixes: fea087fc291b ("irqchip/mbigen: move to use bus_get_dev_root()") Signed-off-by: Chen Jun chenjun102@huawei.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240220111429.110666-1-chenjun102@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/irqchip/irq-mbigen.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-)
--- a/drivers/irqchip/irq-mbigen.c +++ b/drivers/irqchip/irq-mbigen.c @@ -235,22 +235,17 @@ static const struct irq_domain_ops mbige static int mbigen_of_create_domain(struct platform_device *pdev, struct mbigen_device *mgn_chip) { - struct device *parent; struct platform_device *child; struct irq_domain *domain; struct device_node *np; u32 num_pins; int ret = 0;
- parent = bus_get_dev_root(&platform_bus_type); - if (!parent) - return -ENODEV; - for_each_child_of_node(pdev->dev.of_node, np) { if (!of_property_read_bool(np, "interrupt-controller")) continue;
- child = of_platform_device_create(np, NULL, parent); + child = of_platform_device_create(np, NULL, NULL); if (!child) { ret = -ENOMEM; break; @@ -273,7 +268,6 @@ static int mbigen_of_create_domain(struc } }
- put_device(parent); if (ret) of_node_put(np);