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| author | Thierry Reding <treding@nvidia.com> | 2017-08-17 13:06:14 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-18 16:14:37 -0700 |
| commit | b6f6d56c91f5261c55edef2df300698c4486b669 (patch) | |
| tree | 29d44f8bdb6e0e9fd844b975bab9d2f6144c0aff /drivers/pci | |
| parent | cdbeb633ca71a02b7b63bfeb94994bf4e1a0b894 (diff) | |
| download | op-kernel-dev-b6f6d56c91f5261c55edef2df300698c4486b669.zip op-kernel-dev-b6f6d56c91f5261c55edef2df300698c4486b669.tar.gz | |
PCI: Allow PCI express root ports to find themselves
If the pci_find_pcie_root_port() function is called on a root port
itself, return the root port rather than NULL.
This effectively reverts commit 0e405232871d6 ("PCI: fix oops when
try to find Root Port for a PCI device") which added an extra check
that would now be redundant.
Fixes: a99b646afa8a ("PCI: Disable PCIe Relaxed Ordering if unsupported")
Fixes: c56d4450eb68 ("PCI: Turn off Request Attributes to avoid Chelsio T5 Completion erratum")
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Shawn Lin <shawn.lin@rock-chips.com>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index da5570c..fdf65a6 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -514,7 +514,7 @@ EXPORT_SYMBOL(pci_find_resource); */ 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)) { @@ -522,11 +522,10 @@ struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev) bridge = pci_upstream_bridge(bridge); } - if (highest_pcie_bridge && - pci_pcie_type(highest_pcie_bridge) == PCI_EXP_TYPE_ROOT_PORT) - return highest_pcie_bridge; + if (pci_pcie_type(highest_pcie_bridge) != PCI_EXP_TYPE_ROOT_PORT) + return NULL; - return NULL; + return highest_pcie_bridge; } EXPORT_SYMBOL(pci_find_pcie_root_port); |
