Commit fe2bd75b authored Mar 29, 2017 by Keith Busch Committed by Bjorn Helgaas Mar 29, 2017

PCI: Short-circuit pci_device_is_present() for disconnected devices



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>

parent 0170591b

drivers/pci/pci.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -4932,6 +4932,8 @@ bool pci_device_is_present(struct pci_dev *pdev)
		{
		u32 v;

		if (pci_dev_is_disconnected(pdev))
		return false;
		return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0);
		}
		EXPORT_SYMBOL_GPL(pci_device_is_present);

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