pci_create_root_bus is called with NULL as parent in ACPI. On arm64
this ends up calling pci_bus_assign_domain_nr, which crashes when
dereferencing parent.
To fix this, update pci_bus_assign_domain_nr to return if parent is
NULL. Setting up the domain number will be handled from
pcibios_root_bridge_prepare on arm64 when booted with ACPI.
Signed-off-by: Jayachandran C <jchandra@xxxxxxxxxxxx>
---
drivers/pci/pci.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 314db8c..a96c356 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4772,8 +4772,13 @@ int pci_get_new_domain_nr(void)
void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
{
static int use_dt_domains = -1;
- int domain = of_get_pci_domain_nr(parent->of_node);
+ int domain;
+ /* in case of ACPI, parent is NULL */
+ if (parent == NULL)
+ return;
+
+ domain = of_get_pci_domain_nr(parent->of_node);
/*
* Check DT domain and use_dt_domains values.
*
--
1.9.1
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