From: Jianmin Lv <lvjianmin@xxxxxxxxxxx> commit 112eaa8fec5ea75f1be003ec55760b09a86799f8 upstream. In pch_pic_parse_madt(), a NULL parent pointer will be returned from acpi_get_vec_parent() for second pch-pic domain related to second bridge while calling eiointc_acpi_init() at first time, where the parent of it has not been initialized yet, and will be initialized during second time calling eiointc_acpi_init(). So, it's reasonable to return zero so that failure of acpi_table_parse_madt() will be avoided, or else acpi_cascade_irqdomain_init() will return and initialization of followed pch_msi domain will be skipped. Although it does not matter when pch_msi_parse_madt() returns -EINVAL if no invalid parent is found, it's also reasonable to return zero for that. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Link: https://lore.kernel.org/r/20230407083453.6305-2-lvjianmin@xxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/irqchip/irq-loongson-eiointc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/irqchip/irq-loongson-eiointc.c +++ b/drivers/irqchip/irq-loongson-eiointc.c @@ -343,7 +343,7 @@ static int __init pch_pic_parse_madt(uni if (parent) return pch_pic_acpi_init(parent, pchpic_entry); - return -EINVAL; + return 0; } static int __init pch_msi_parse_madt(union acpi_subtable_headers *header, @@ -355,7 +355,7 @@ static int __init pch_msi_parse_madt(uni if (parent) return pch_msi_acpi_init(parent, pchmsi_entry); - return -EINVAL; + return 0; } static int __init acpi_cascade_irqdomain_init(void)
