PCI: dwc: designware: Handle ->host_init() failures

In several dwc-based drivers, ->host_init() can fail, so make sure to
propagate and handle this to avoid continuing operation of a driver or
hardware in an invalid state.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>

drivers/pci/dwc/pcie-artpec6.c

diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
index 01c6f78..5d81f1d 100644
--- a/drivers/pci/dwc/pcie-artpec6.c
+++ b/drivers/pci/dwc/pcie-artpec6.c
@@ -175,13 +175,15 @@ static void artpec6_pcie_enable_interrupts(struct artpec6_pcie *artpec6_pcie)
 		dw_pcie_msi_init(pp);
 }
 
-static void artpec6_pcie_host_init(struct pcie_port *pp)
+static int artpec6_pcie_host_init(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
 
 	artpec6_pcie_establish_link(artpec6_pcie);
 	artpec6_pcie_enable_interrupts(artpec6_pcie);
+
+	return 0;
 }
 
 static const struct dw_pcie_host_ops artpec6_pcie_host_ops = {