[PATCH v2 3/8] pci: Add pci_hp_reset_slot

[Alex Williamson <alex.williamson@redhat.com>]

Provide an interface to get to hotplug controller reset_slot callback

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 drivers/pci/hotplug/pci_hotplug_core.c |   24 ++++++++++++++++++++++++
 include/linux/pci_hotplug.h            |    8 ++++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index 202f4a9..1d0fee4 100644
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -537,6 +537,29 @@ int __must_check pci_hp_change_slot_info(struct hotplug_slot *hotplug,
 	return 0;
 }
 
+/**
+ * pci_hp_reset_slot - reset slot
+ *
+ * @hotplug: pointer to hotplug slot to reset
+ * @probe: reset slot (0) or just probe
+ *
+ * Returns 0 if successful, anything else for an error.
+ */
+int pci_hp_reset_slot(struct hotplug_slot *hotplug, int probe)
+{
+	int result = -ENOTTY;
+
+	if (!hotplug || !try_module_get(hotplug->ops->owner))
+		return result;
+
+	if (hotplug->ops->reset_slot)
+		result = hotplug->ops->reset_slot(hotplug, probe);
+
+	module_put(hotplug->ops->owner);
+
+	return result;
+}
+
 static int __init pci_hotplug_init (void)
 {
 	int result;
@@ -570,3 +593,4 @@ MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
 EXPORT_SYMBOL_GPL(__pci_hp_register);
 EXPORT_SYMBOL_GPL(pci_hp_deregister);
 EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
+EXPORT_SYMBOL_GPL(pci_hp_reset_slot);
diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h
index 0d3a604..d771cee 100644
--- a/include/linux/pci_hotplug.h
+++ b/include/linux/pci_hotplug.h
@@ -135,6 +135,14 @@ extern int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *pbus,
 extern int pci_hp_deregister(struct hotplug_slot *slot);
 extern int __must_check pci_hp_change_slot_info	(struct hotplug_slot *slot,
 						 struct hotplug_slot_info *info);
+#ifdef CONFIG_HOTPLUG_PCI
+int pci_hp_reset_slot(struct hotplug_slot *slot, int probe);
+#else
+static inline int pci_hp_reset_slot(struct hotplug_slot *slot, int probe)
+{
+	return -ENOTTY;
+}
+#endif
 
 /* use a define to avoid include chaining to get THIS_MODULE & friends */
 #define pci_hp_register(slot, pbus, devnr, name) \