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PCI: Short-circuit pci_device_is_present() for disconnected devices

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If the PCI device is disconnected, return false immediately from
pci_device_is_present().  pci_device_is_present() uses the bus accessors,
so the early return in the device accessors doesn't help here.

Tested-by: Krishna Dhulipala <krishnad@fb.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Wei Zhang <wzhang@fb.com>
This commit is contained in:
Keith Busch 2017-03-29 22:49:17 -05:00 • committed by Bjorn Helgaas
parent 0170591bb0
commit fe2bd75b22
1 changed files with 2 additions and 0 deletions
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2
drivers/pci/pci.c
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@ -4932,6 +4932,8 @@ bool pci_device_is_present(struct pci_dev *pdev)
{ {
u32 v; u32 v;
if (pci_dev_is_disconnected(pdev))
return false;
return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0); return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0);
} }
EXPORT_SYMBOL_GPL(pci_device_is_present); EXPORT_SYMBOL_GPL(pci_device_is_present);