linux-kernel - Re: [PATCH v5 04/16] PCI: prevent duplicate slot names

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Date:	Thu, 9 Oct 2008 20:11:25 -0600
From:	Alex Chiang <achiang@...com>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	jbarnes@...tuousgeek.org, kristen.c.accardi@...el.com,
	matthew@....cx
Subject: Re: [PATCH v5 04/16] PCI: prevent duplicate slot names

commit 2338f56b789bb030434be828c4788679d72901b5
Author: Alex Chiang <achiang@...com>
Date:   Thu Oct 9 19:56:58 2008 -0600

    PCI: update pci_create_slot() to take a 'hotplug' param
    
    Slot detection drivers can co-exist with hotplug drivers. The names
    of the detected/claimed slots may be different depending on module
    load order.
    
    For legacy reasons, we need to allow hotplug drivers to override
    the slot name if a detection driver is loaded first (and they find
    the same slots).
    
    Creating and overriding slot names should be an atomic operation,
    otherwise you get a locking nightmare as various drivers race to
    call pci_create_slot().
    
    pci_create_slot() is already serialized by grabbing the pci_bus_sem.
    
    We update the API and add a 'hotplug' param, which is:
    
    	set if the caller is a hotplug driver
    	unset if the caller is a detection driver
    
    pci_create_slot() does not actually use the 'hotplug' parameter in this
    patch. A later patch will add the logic that uses it.
    
    Cc: jbarnes@...tuousgeek.org
    Cc: kristen.c.accardi@...el.com
    Cc: matthew@....cx
    Cc: kaneshige.kenji@...fujitsu.com
    Signed-off-by: Alex Chiang <achiang@...com>

diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
index d5b4ef8..8d4a568 100644
--- a/drivers/acpi/pci_slot.c
+++ b/drivers/acpi/pci_slot.c
@@ -150,7 +150,7 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 	}
 
 	snprintf(name, sizeof(name), "%u", (u32)sun);
-	pci_slot = pci_create_slot(pci_bus, device, name);
+	pci_slot = pci_create_slot(pci_bus, device, name, NULL);
 	if (IS_ERR(pci_slot)) {
 		err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
 		kfree(slot);
diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index 0e7a511..191b58e 100644
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -579,7 +579,7 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr,
 	 * driver and call it here again. If we've already created the
 	 * pci_slot, the interface will simply bump the refcount.
 	 */
-	pci_slot = pci_create_slot(bus, slot_nr, name);
+	pci_slot = pci_create_slot(bus, slot_nr, name, slot);
 	if (IS_ERR(pci_slot))
 		return PTR_ERR(pci_slot);
 
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index b9b90ab..0e009c3 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -83,6 +83,7 @@ static struct kobj_type pci_slot_ktype = {
  * @parent: struct pci_bus of parent bridge
  * @slot_nr: PCI_SLOT(pci_dev->devfn) or -1 for placeholder
  * @name: user visible string presented in /sys/bus/pci/slots/<name>
+ * @hotplug: set if caller is hotplug driver, NULL otherwise
  *
  * PCI slots have first class attributes such as address, speed, width,
  * and a &struct pci_slot is used to manage them. This interface will
@@ -111,7 +112,8 @@ static struct kobj_type pci_slot_ktype = {
  */
 
 struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
-				 const char *name)
+				 const char *name,
+				 struct hotplug_slot *hotplug)
 {
 	struct pci_dev *dev;
 	struct pci_slot *slot;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 5d96b7a..8bbbbbc 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -508,7 +508,8 @@ struct pci_bus *pci_create_bus(struct device *parent, int bus,
 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
 				int busnr);
 struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
-				 const char *name);
+				 const char *name,
+				 struct hotplug_slot *hotplug);
 void pci_destroy_slot(struct pci_slot *slot);
 void pci_renumber_slot(struct pci_slot *slot, int slot_nr);
 int pci_scan_slot(struct pci_bus *bus, int devfn);
--
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