PCI: Remove unused pci_request_region_exclusive()

pci_request_region_exclusive() was introduced with commit e8de1481
("resource: allow MMIO exclusivity for device drivers") in 2.6.29 which
was released 2008.

It never had an in tree user since then, so after 11 years later let's
remove it.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci.c

@@ -3706,31 +3706,6 @@ int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
 }
 EXPORT_SYMBOL(pci_request_region);
 
-/**
- *	pci_request_region_exclusive - Reserved PCI I/O and memory resource
- *	@pdev: PCI device whose resources are to be reserved
- *	@bar: BAR to be reserved
- *	@res_name: Name to be associated with resource.
- *
- *	Mark the PCI region associated with PCI device @pdev BR @bar as
- *	being reserved by owner @res_name.  Do not access any
- *	address inside the PCI regions unless this call returns
- *	successfully.
- *
- *	Returns 0 on success, or %EBUSY on error.  A warning
- *	message is also printed on failure.
- *
- *	The key difference that _exclusive makes it that userspace is
- *	explicitly not allowed to map the resource via /dev/mem or
- *	sysfs.
- */
-int pci_request_region_exclusive(struct pci_dev *pdev, int bar,
-				 const char *res_name)
-{
-	return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE);
-}
-EXPORT_SYMBOL(pci_request_region_exclusive);
-
 /**
  * pci_release_selected_regions - Release selected PCI I/O and memory resources
  * @pdev: PCI device whose resources were previously reserved

include/linux/pci.h

@@ -1233,7 +1233,6 @@ int __must_check pci_request_regions(struct pci_dev *, const char *);
 int __must_check pci_request_regions_exclusive(struct pci_dev *, const char *);
 void pci_release_regions(struct pci_dev *);
 int __must_check pci_request_region(struct pci_dev *, int, const char *);
-int __must_check pci_request_region_exclusive(struct pci_dev *, int, const char *);
 void pci_release_region(struct pci_dev *, int);
 int pci_request_selected_regions(struct pci_dev *, int, const char *);
 int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);