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From: Ding Tianhong <dingtianhong@huawei.com>
To: <leedom@chelsio.com>, <ashok.raj@intel.com>,
	<bhelgaas@google.com>, <helgaas@kernel.org>, <werner@chelsio.com>,
	<ganeshgr@chelsio.com>, <asit.k.mallick@intel.com>,
	<patrick.j.cramer@intel.com>, <Suravee.Suthikulpanit@amd.com>,
	<Bob.Shaw@amd.com>, <l.stach@pengutronix.de>,
	<amira@mellanox.com>, <gabriele.paoloni@huawei.com>,
	<David.Laight@aculab.com>, <jeffrey.t.kirsher@intel.com>,
	<catalin.marinas@arm.com>, <will.deacon@arm.com>,
	<mark.rutland@arm.com>, <robin.murphy@arm.com>,
	<davem@davemloft.net>, <alexander.duyck@gmail.com>,
	<eric.dumazet@gmail.com>, <linux-arm-kernel@lists.infradead.org>,
	<netdev@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linuxarm@huawei.com>
Cc: Ding Tianhong <dingtianhong@huawei.com>,
	Thierry Reding <thierry.reding@gmail.com>
Subject: [PATCH net] PCI: fix the return value for the pci_find_pcie_root_port()
Date: Thu, 17 Aug 2017 10:25:30 +0800	[thread overview]
Message-ID: <1502936730-7368-1-git-send-email-dingtianhong@huawei.com> (raw)

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@gmail.com>
Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.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

             reply	other threads:[~2017-08-17  2:26 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-17  2:25 Ding Tianhong [this message]
2017-08-17  2:42 ` [PATCH net] PCI: fix the return value for the pci_find_pcie_root_port() David Miller
2017-08-17 10:51 ` Thierry Reding
2017-08-17 12:40   ` Ding Tianhong
2017-08-17 13:30     ` Thierry Reding
2017-08-17 13:38       ` Ding Tianhong
2017-08-17 11:06 ` [PATCH] PCI: Allow PCI express root ports to find themselves Thierry Reding
2017-08-17 16:58   ` Bjorn Helgaas
2017-08-18  1:29   ` Shawn Lin
2017-08-18  4:32   ` Michael Ellerman
2017-08-18 23:14   ` David Miller

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