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irqchip/mbigen: Don't use bus_get_dev_root() to find the parent

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commit fb33a46cd7 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: fea087fc29 ("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>
This commit is contained in:
Chen Jun
2024-02-20 19:14:29 +08:00
committed by Greg Kroah-Hartman
parent b0365460e9
commit a9ab338683
1 changed files with 1 additions and 7 deletions
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drivers/irqchip/irq-mbigen.c
+1 -7
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@@ -235,22 +235,17 @@ static const struct irq_domain_ops mbigen_domain_ops = {
static int mbigen_of_create_domain(struct platform_device *pdev, static int mbigen_of_create_domain(struct platform_device *pdev,
struct mbigen_device *mgn_chip) struct mbigen_device *mgn_chip)
{ {
struct device *parent;
struct platform_device *child; struct platform_device *child;
struct irq_domain *domain; struct irq_domain *domain;
struct device_node *np; struct device_node *np;
u32 num_pins; u32 num_pins;
int ret = 0; 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) { for_each_child_of_node(pdev->dev.of_node, np) {
if (!of_property_read_bool(np, "interrupt-controller")) if (!of_property_read_bool(np, "interrupt-controller"))
continue; continue;
child = of_platform_device_create(np, NULL, parent); child = of_platform_device_create(np, NULL, NULL);
if (!child) { if (!child) {
ret = -ENOMEM; ret = -ENOMEM;
break; break;
@@ -273,7 +268,6 @@ static int mbigen_of_create_domain(struct platform_device *pdev,
} }
} }
put_device(parent);
if (ret) if (ret)
of_node_put(np); of_node_put(np);