This patch creates the symlink to the hotplug driver at the hotplug slot directory
(/sys/bus/pci/slots/<slot_name>). As a result, we can know easily what driver manages
the hotplug slot.
Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
---
drivers/pci/hotplug/pci_hotplug_core.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
Index: linux-next.29rc6/drivers/pci/hotplug/pci_hotplug_core.c
===================================================================
--- linux-next.29rc6.orig/drivers/pci/hotplug/pci_hotplug_core.c
+++ linux-next.29rc6/drivers/pci/hotplug/pci_hotplug_core.c
@@ -420,9 +420,20 @@ static int has_test_file(struct pci_slot
return -ENOENT;
}
+static int has_owner_file(struct pci_slot *pci_slot)
+{
+ struct hotplug_slot *slot = pci_slot->hotplug;
+ if ((!slot) || (!slot->ops))
+ return -ENODEV;
+ if (slot->ops->owner)
+ return 0;
+ return -ENOENT;
+}
+
static int fs_add_slot(struct pci_slot *slot)
{
int retval = 0;
+ struct hotplug_slot *hotplug = slot->hotplug;
if (has_power_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj, &hotplug_slot_attr_power.attr);
@@ -472,8 +483,20 @@ static int fs_add_slot(struct pci_slot *
goto exit_test;
}
+ if (has_owner_file(slot) == 0) {
+ retval = sysfs_create_link(&slot->kobj,
+ &hotplug->ops->owner->mkobj.kobj,
+ hotplug->ops->owner->name);
+ if (retval)
+ goto exit_owner;
+ }
+
goto exit;
+exit_owner:
+ if (has_test_file(slot) == 0)
+ sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
+
exit_test:
if (has_cur_bus_speed_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
@@ -524,6 +547,9 @@ static void fs_remove_slot(struct pci_sl
if (has_test_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
+
+ if (has_owner_file(slot) == 0)
+ sysfs_remove_link(&slot->kobj, slot->hotplug->ops->owner->name);
}
static struct hotplug_slot *get_slot_from_name (const char *name)
--
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