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PCI: Use dev->has_secondary_link to find downstream PCIe links

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Previously we assumed that PCIe Root Ports and Downstream Ports had Links
on their secondary side.  That is true in most systems, but it is possible
to connect a switch with either an Upstream or a Downstream Port leading
downstream.

Instead of relying on the component type to identify devices that have
links leading downstream, use the "dev->has_secondary_link" field.

[bhelgaas: changelog]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yijing Wang 2015-05-21 15:05:04 +08:00 committed by Bjorn Helgaas
parent c8fc933940
commit 777e61ea40
3 changed files with 3 additions and 5 deletions
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3
drivers/pci/pcie/aer/aerdrv_core.c
View file

@ -425,8 +425,7 @@ static pci_ers_result_t reset_link(struct pci_dev *dev)
if (driver && driver->reset_link) {
status = driver->reset_link(udev);
} else if (pci_pcie_type(udev) == PCI_EXP_TYPE_DOWNSTREAM ||
pci_pcie_type(udev) == PCI_EXP_TYPE_ROOT_PORT) {
} else if (udev->has_secondary_link) {
status = default_reset_link(udev);
} else {
dev_printk(KERN_DEBUG, &dev->dev,

2
drivers/pci/probe.c
View file

@ -1629,7 +1629,7 @@ static int only_one_child(struct pci_bus *bus)
return 0;
if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
return 1;
if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM &&
if (parent->has_secondary_link &&
!pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
return 1;
return 0;

3
drivers/pci/vc.c
View file

@ -108,8 +108,7 @@ static void pci_vc_enable(struct pci_dev *dev, int pos, int res)
struct pci_dev *link = NULL;
/* Enable VCs from the downstream device */
if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM)
if (!dev->has_secondary_link)
return;
ctrl_pos = pos + PCI_VC_RES_CTRL + (res * PCI_CAP_VC_PER_VC_SIZEOF);