PCI: Remove unused ID-Based Ordering support

My philosophy is unused code is dead code. And dead code is subject to bit
rot and is a likely source of bugs. Use it or lose it.

This reverts b48d4425b602 ("PCI: add ID-based ordering enable/disable
support"), removing these interfaces:

pci_enable_ido()
pci_disable_ido()

[bhelgaas: split to separate patch, also remove prototypes from pci.h]
Signed-off-by: Stephen Hemminger <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
CC: Jesse Barnes <[e-mail]>

drivers/pci/pci.c

···
 	}
 }
 
-/**
- * pci_enable_ido - enable ID-based Ordering on a device
- * @dev: the PCI device
- * @type: which types of IDO to enable
- *
- * Enable ID-based ordering on @dev.  @type can contain the bits
- * %PCI_EXP_IDO_REQUEST and/or %PCI_EXP_IDO_COMPLETION to indicate
- * which types of transactions are allowed to be re-ordered.
- */
-void pci_enable_ido(struct pci_dev *dev, unsigned long type)
-{
-	u16 ctrl = 0;
-
-	if (type & PCI_EXP_IDO_REQUEST)
-		ctrl |= PCI_EXP_DEVCTL2_IDO_REQ_EN;
-	if (type & PCI_EXP_IDO_COMPLETION)
-		ctrl |= PCI_EXP_DEVCTL2_IDO_CMP_EN;
-	if (ctrl)
-		pcie_capability_set_word(dev, PCI_EXP_DEVCTL2, ctrl);
-}
-EXPORT_SYMBOL(pci_enable_ido);
-
-/**
- * pci_disable_ido - disable ID-based ordering on a device
- * @dev: the PCI device
- * @type: which types of IDO to disable
- */
-void pci_disable_ido(struct pci_dev *dev, unsigned long type)
-{
-	u16 ctrl = 0;
-
-	if (type & PCI_EXP_IDO_REQUEST)
-		ctrl |= PCI_EXP_DEVCTL2_IDO_REQ_EN;
-	if (type & PCI_EXP_IDO_COMPLETION)
-		ctrl |= PCI_EXP_DEVCTL2_IDO_CMP_EN;
-	if (ctrl)
-		pcie_capability_clear_word(dev, PCI_EXP_DEVCTL2, ctrl);
-}
-EXPORT_SYMBOL(pci_disable_ido);
-
 static int pci_acs_enable;
 
 /**

include/linux/pci.h

···
 	return __pci_enable_wake(dev, state, false, enable);
 }
 
-#define PCI_EXP_IDO_REQUEST	(1<<0)
-#define PCI_EXP_IDO_COMPLETION	(1<<1)
-void pci_enable_ido(struct pci_dev *dev, unsigned long type);
-void pci_disable_ido(struct pci_dev *dev, unsigned long type);
-
 /* For use by arch with custom probe code */
 void set_pcie_port_type(struct pci_dev *pdev);
 void set_pcie_hotplug_bridge(struct pci_dev *pdev);
···
 				  int enable)
 {
 	return 0;
-}
-
-static inline void pci_enable_ido(struct pci_dev *dev, unsigned long type)
-{
-}
-
-static inline void pci_disable_ido(struct pci_dev *dev, unsigned long type)
-{
 }
 
 static inline int pci_request_regions(struct pci_dev *dev, const char *res_name)