[PATCH 2/2] LoongArch: Fixed Loongarch LOONGSON_PCH_MSI func built errors

[Yupeng Li]

When CONFIG_LOONGSON_PCH_MSI was disabled,kernel build 
with errors like:

MODPOST vmlinux.symvers
MODINFO modules.builtin.modinfo
GEN     modules.builtin
LD      .tmp_vmlinux.kallsyms1
loongarch64-linux-gnu-ld: arch/loongarch/pci/pci.o: in function `pcibios_device_add':
pci.c:(.text+0x1b8): undefined reference to `get_pch_msi_handle'
make: *** [Makefile:1171：vmlinux] 错误 1

Reviewed-by: Caicai <caizp2008@xxxxxxx>
Signed-off-by: Yupeng Li <liyupeng@xxxxxxxxxx>
---
 arch/loongarch/pci/pci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/pci/pci.c b/arch/loongarch/pci/pci.c
index e9b7c34d9b6d..44cf57dafcdf 100644
--- a/arch/loongarch/pci/pci.c
+++ b/arch/loongarch/pci/pci.c
@@ -65,13 +65,14 @@ subsys_initcall(pcibios_init);
 
 int pcibios_device_add(struct pci_dev *dev)
 {
+#ifdef CONFIG_LOONGSON_PCH_MSI
 	int id;
 	struct irq_domain *dom;
 
 	id = pci_domain_nr(dev->bus);
 	dom = irq_find_matching_fwnode(get_pch_msi_handle(id), DOMAIN_BUS_PCI_MSI);
 	dev_set_msi_domain(&dev->dev, dom);
-
+#endif
 	return 0;
 }
 
-- 
2.34.1