PCI: Remove redundant probes for device reset support

We probe every device for whether it supports reset so we can tell whether
to create a sysfs "reset" file for it.  We do that probe in
pci_init_capabilities() during enumeration and save the result in
dev->reset_fn.  The result doesn't depend on any other devices on the bus
and shouldn't change after boot, so we don't need to do the probe again.

Remove the pci_probe_reset_function() calls and rely on the dev->reset_fn
we found during enumeration.  No functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/pci/pci.c

@@ -4450,9 +4450,8 @@ int pci_reset_function(struct pci_dev *dev)
 {
 	int rc;
 
-	rc = pci_probe_reset_function(dev);
-	if (rc)
-		return rc;
+	if (!dev->reset_fn)
+		return -ENOTTY;
 
 	pci_dev_lock(dev);
 	pci_dev_save_and_disable(dev);
@@ -4487,9 +4486,8 @@ int pci_reset_function_locked(struct pci_dev *dev)
 {
 	int rc;
 
-	rc = pci_probe_reset_function(dev);
-	if (rc)
-		return rc;
+	if (!dev->reset_fn)
+		return -ENOTTY;
 
 	pci_dev_save_and_disable(dev);
 
@@ -4511,9 +4509,8 @@ int pci_try_reset_function(struct pci_dev *dev)
 {
 	int rc;
 
-	rc = pci_probe_reset_function(dev);
-	if (rc)
-		return rc;
+	if (!dev->reset_fn)
+		return -ENOTTY;
 
 	if (!pci_dev_trylock(dev))
 		return -EAGAIN;