PCI: Remove pci_ats_enabled()

Remove pci_ats_enabled().  There are no callers outside the ATS code
itself.  We don't need to check ats_cap, because if we don't find an ATS
capability, we'll never set ats_enabled.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>

drivers/pci/ats.c

@@ -43,7 +43,7 @@ int pci_enable_ats(struct pci_dev *dev, int ps)
 	if (!dev->ats_cap)
 		return -EINVAL;
 
-	if (WARN_ON(pci_ats_enabled(dev)))
+	if (WARN_ON(dev->ats_enabled))
 		return -EBUSY;
 
 	if (ps < PCI_ATS_MIN_STU)
@@ -80,7 +80,7 @@ void pci_disable_ats(struct pci_dev *dev)
 	struct pci_dev *pdev;
 	u16 ctrl;
 
-	if (WARN_ON(!pci_ats_enabled(dev)))
+	if (WARN_ON(!dev->ats_enabled))
 		return;
 
 	if (atomic_read(&dev->ats_ref_cnt))
@@ -103,7 +103,7 @@ void pci_restore_ats_state(struct pci_dev *dev)
 {
 	u16 ctrl;
 
-	if (!pci_ats_enabled(dev))
+	if (!dev->ats_enabled)
 		return;
 
 	ctrl = PCI_ATS_CTRL_ENABLE;

include/linux/pci.h

@@ -1303,13 +1303,11 @@ void pci_ats_init(struct pci_dev *dev);
 int pci_enable_ats(struct pci_dev *dev, int ps);
 void pci_disable_ats(struct pci_dev *dev);
 int pci_ats_queue_depth(struct pci_dev *dev);
-static inline int pci_ats_enabled(struct pci_dev *dev) { return dev->ats_cap && dev->ats_enabled; }
 #else
 static inline void pci_ats_init(struct pci_dev *d) { }
 static inline int pci_enable_ats(struct pci_dev *d, int ps) { return -ENODEV; }
 static inline void pci_disable_ats(struct pci_dev *d) { }
 static inline int pci_ats_queue_depth(struct pci_dev *d) { return -ENODEV; }
-static inline int pci_ats_enabled(struct pci_dev *d) { return 0; }
 #endif
 
 void pci_cfg_access_lock(struct pci_dev *dev);