[PATCH v6-resend 17/17] PCI Hotplug: fakephp: add duplicate slot name debugging

[Alex Chiang <achiang@hp.com>]

The PCI core now manages slot names on behalf of slot detection
and slot hotplug drivers, including the handling of duplicate
slot names.

We can use the fakephp driver to help test the new functionality.
Add a 'dup_slots' module param to force fakephp to create multiple
slots with the same name. We can then verify that the PCI core
correctly renamed the slots.

	sapphire:/sys/bus/pci/slots # modprobe fakephp dup_slots
	sapphire:/sys/bus/pci/slots # ls
	fake    fake-10  fake-3  fake-5  fake-7  fake-9
	fake-1  fake-2   fake-4  fake-6  fake-8

Cc: jbarnes@virtuousgeek.org
Cc: kristen.c.accardi@intel.com
Cc: matthew@wil.cx
Cc: kaneshige.kenji@jp.fujitsu.com
Signed-off-by: Alex Chiang <achiang@hp.com>
---

 drivers/pci/hotplug/fakephp.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/hotplug/fakephp.c b/drivers/pci/hotplug/fakephp.c
index 24dcbf1..3a2637a 100644
--- a/drivers/pci/hotplug/fakephp.c
+++ b/drivers/pci/hotplug/fakephp.c
@@ -69,6 +69,7 @@ struct dummy_slot {
 };
 
 static int debug;
+static int dup_slots;
 static LIST_HEAD(slot_list);
 static struct workqueue_struct *dummyphp_wq;
 
@@ -121,7 +122,11 @@ static int add_slot(struct pci_dev *dev)
 	if (!dslot)
 		goto error_info;
 
-	snprintf(name, SLOT_NAME_SIZE, "fake%d", count++);
+	if (dup_slots)
+		snprintf(name, SLOT_NAME_SIZE, "fake");
+	else
+		snprintf(name, SLOT_NAME_SIZE, "fake%d", count++);
+	dbg("slot->name = %s\n", name);
 	slot->ops = &dummy_hotplug_slot_ops;
 	slot->release = &dummy_release;
 	slot->private = dslot;
@@ -375,4 +380,5 @@ MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
 module_param(debug, bool, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
-
+module_param(dup_slots, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(dup_slots, "Force duplicate slot names for debugging");