PCI: aardvark: Check for errors from pci_bridge_emul_init() call

Function pci_bridge_emul_init() may fail so correctly check for errors.

Link: https://lore.kernel.org/r/20200907111038.5811-3-pali@kernel.org
Fixes: 8a3ebd8de328 ("PCI: aardvark: Implement emulated root PCI bridge config space")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 1c5f2fd..2e2e2a2 100644 (file)
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -607,7 +607,7 @@ static struct pci_bridge_emul_ops advk_pci_bridge_emul_ops = {
  * Initialize the configuration space of the PCI-to-PCI bridge
  * associated with the given PCIe interface.
  */
-static void advk_sw_pci_bridge_init(struct advk_pcie *pcie)
+static int advk_sw_pci_bridge_init(struct advk_pcie *pcie)
 {
        struct pci_bridge_emul *bridge = &pcie->bridge;
 
@@ -633,8 +633,7 @@ static void advk_sw_pci_bridge_init(struct advk_pcie *pcie)
        bridge->data = pcie;
        bridge->ops = &advk_pci_bridge_emul_ops;
 
-       pci_bridge_emul_init(bridge, 0);
-
+       return pci_bridge_emul_init(bridge, 0);
 }
 
 static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus,
@@ -1167,7 +1166,11 @@ static int advk_pcie_probe(struct platform_device *pdev)
 
        advk_pcie_setup_hw(pcie);
 
-       advk_sw_pci_bridge_init(pcie);
+       ret = advk_sw_pci_bridge_init(pcie);
+       if (ret) {
+               dev_err(dev, "Failed to register emulated root PCI bridge\n");
+               return ret;
+       }
 
        ret = advk_pcie_init_irq_domain(pcie);
        if (ret) {