linux-kernel - [PATCH net] PCI: fix the return value for the pci_find_pcie_root

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Message-ID: <1502936730-7368-1-git-send-email-dingtianhong@huawei.com>
Date:   Thu, 17 Aug 2017 10:25:30 +0800
From:   Ding Tianhong <dingtianhong@...wei.com>
To:     <leedom@...lsio.com>, <ashok.raj@...el.com>, <bhelgaas@...gle.com>,
        <helgaas@...nel.org>, <werner@...lsio.com>, <ganeshgr@...lsio.com>,
        <asit.k.mallick@...el.com>, <patrick.j.cramer@...el.com>,
        <Suravee.Suthikulpanit@....com>, <Bob.Shaw@....com>,
        <l.stach@...gutronix.de>, <amira@...lanox.com>,
        <gabriele.paoloni@...wei.com>, <David.Laight@...lab.com>,
        <jeffrey.t.kirsher@...el.com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <mark.rutland@....com>,
        <robin.murphy@....com>, <davem@...emloft.net>,
        <alexander.duyck@...il.com>, <eric.dumazet@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>
CC:     Ding Tianhong <dingtianhong@...wei.com>,
        Thierry Reding <thierry.reding@...il.com>
Subject: [PATCH net] PCI: fix the return value for the pci_find_pcie_root_port()

The pci_find_pcie_root_port() would return NULL if the given
dev is already a Root Port, it looks like unfriendly to the
PCIe Root Port device, Thierry and Bjorn suggest to let this
function return the given dev under this circumstances.

Fixes: 0e405232871d6 ("PCI: fix oops when try to find Root Port for a PCI device")
Suggested-by: Thierry Reding <thierry.reding@...il.com>
Suggested-by: Bjorn Helgaas <helgaas@...nel.org>
Signed-off-by: Thierry Reding <thierry.reding@...il.com>
Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
---
 drivers/pci/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 7e2022f..352bb53 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -514,7 +514,7 @@ struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res)
  */
 struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev)
 {
-	struct pci_dev *bridge, *highest_pcie_bridge = NULL;
+	struct pci_dev *bridge, *highest_pcie_bridge = dev;
 
 	bridge = pci_upstream_bridge(dev);
 	while (bridge && pci_is_pcie(bridge)) {
-- 
1.8.3.1