PCI: Export pci_dev_trylock() and pci_dev_unlock()

Other places in the kernel use this form, and so just
provide a common path for it.
Acked-by: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: NLuis Chamberlain <mcgrof@kernel.org>
Reviewed-by: NCornelia Huck <cohuck@redhat.com>
Link: https://lore.kernel.org/r/20210623022824.308041-2-mcgrof@kernel.orgSigned-off-by: NAlex Williamson <alex.williamson@redhat.com>

drivers/pci/pci.c

@@ -5028,7 +5028,7 @@ static void pci_dev_lock(struct pci_dev *dev)
 }
 
 /* Return 1 on successful lock, 0 on contention */
-static int pci_dev_trylock(struct pci_dev *dev)
+int pci_dev_trylock(struct pci_dev *dev)
 {
 	if (pci_cfg_access_trylock(dev)) {
 		if (device_trylock(&dev->dev))
@@ -5038,12 +5038,14 @@ static int pci_dev_trylock(struct pci_dev *dev)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(pci_dev_trylock);
 
-static void pci_dev_unlock(struct pci_dev *dev)
+void pci_dev_unlock(struct pci_dev *dev)
 {
 	device_unlock(&dev->dev);
 	pci_cfg_access_unlock(dev);
 }
+EXPORT_SYMBOL_GPL(pci_dev_unlock);
 
 static void pci_dev_save_and_disable(struct pci_dev *dev)
 {

include/linux/pci.h

@@ -1621,6 +1621,9 @@ void pci_cfg_access_lock(struct pci_dev *dev);
 bool pci_cfg_access_trylock(struct pci_dev *dev);
 void pci_cfg_access_unlock(struct pci_dev *dev);
 
+int pci_dev_trylock(struct pci_dev *dev);
+void pci_dev_unlock(struct pci_dev *dev);
+
 /*
  * PCI domain support.  Sometimes called PCI segment (eg by ACPI),
  * a PCI domain is defined to be a set of PCI buses which share