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[PATCHv6,5/5] pci: Quick return for pci_device_is_present

Message ID 1486495957-26177-6-git-send-email-keith.busch@intel.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Keith Busch Feb. 7, 2017, 7:32 p.m. UTC 
If the pci device is disconnected, return false immediately for checking
presence. We can't use the early return in pci device config accessors
since this function uses the bus accessors.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/pci/pci.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a881c0d..b8d37e7 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -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);