Commit 8d8b2669 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'pci/virtualization' 

- Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store() (Yicong
  Yang, Jay Zhou)

* pci/virtualization:
  PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()
parents f1bde278 a91ee0e9

drivers/pci/pci.c

+5 −5
Original line number Diff line number Diff line
@@ -5150,19 +5150,19 @@ static int pci_reset_bus_function(struct pci_dev *dev, bool probe) 


void pci_dev_lock(struct pci_dev *dev)

{

	pci_cfg_access_lock(dev);

	/* block PM suspend, driver probe, etc. */

	device_lock(&dev->dev);

	pci_cfg_access_lock(dev);

}

EXPORT_SYMBOL_GPL(pci_dev_lock);



/* Return 1 on successful lock, 0 on contention */

int pci_dev_trylock(struct pci_dev *dev)

{

	if (pci_cfg_access_trylock(dev)) {

		if (device_trylock(&dev->dev))

	if (device_trylock(&dev->dev)) {

		if (pci_cfg_access_trylock(dev))

			return 1;

		pci_cfg_access_unlock(dev);

		device_unlock(&dev->dev);

	}



	return 0;
@@ -5171,8 +5171,8 @@ EXPORT_SYMBOL_GPL(pci_dev_trylock); 


void pci_dev_unlock(struct pci_dev *dev)

{

	device_unlock(&dev->dev);

	pci_cfg_access_unlock(dev);

	device_unlock(&dev->dev);

}

EXPORT_SYMBOL_GPL(pci_dev_unlock);