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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        =?UTF-8?q?Marek=20Beh=C3=BAn?= <marek.behun@nic.cz>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.9 521/757] PCI: aardvark: Check for errors from pci_bridge_emul_init() call
Date:   Tue, 27 Oct 2020 14:52:51 +0100
Message-Id: <20201027135514.927646475@linuxfoundation.org>
In-Reply-To: <20201027135450.497324313@linuxfoundation.org>
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From: Pali Rohár <pali@kernel.org>

[ Upstream commit 7862a6134456c8b4f8c39e8c94aa97e5c2f7f2b7 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 1c5f2fd47c511..2e2e2a2ff51d3 100644
--- 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) {
-- 
2.25.1