linux-kernel - [PATCH v2 2/5] PCI: aardvark: Check for errors from pci_bridge_emul

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Date:   Tue,  4 Aug 2020 13:57:44 +0200
From:   Pali Rohár <pali@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     Tomasz Maciej Nowak <tmn505@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Xogium <contact@...ium.me>, marek.behun@....cz
Subject: [PATCH v2 2/5] PCI: aardvark: Check for errors from pci_bridge_emul_init() call

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

Fixes: 8a3ebd8de328 ("PCI: aardvark: Implement emulated root PCI bridge config space")
Signed-off-by: Pali Rohár <pali@...nel.org>
Reviewed-by: Marek Behún <marek.behun@....cz>
---
 drivers/pci/controller/pci-aardvark.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 8caa80b19cf8..d5f58684d962 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -608,7 +608,7 @@ 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;
 
@@ -634,8 +634,7 @@ 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,
@@ -1169,7 +1168,11 @@ 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) {
-- 
2.20.1