[PATCH] acpiphp: add dock event handling

These patches add generic dock event handling to acpiphp.  If there are
pci devices that need to be inserted/removed after the dock event, the
event notification will be handed down to the normal pci hotplug event
handler in acpiphp so that new bridges/devices can be enumerated.

Because some dock stations do not have pci bridges or pci devices that
need to be inserted after a dock, acpiphp will remain loaded to handle
dock events even if no hotpluggable pci slots are discovered.

You probably need to have the pci=assign-busses kernel parameter enabled
to use these patches, and you may not allow ibm_acpi to handle docking
notifications and use this patch.

This patch incorporates feedback provided by many.

Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c
index 60c4c38047a3..bce71c933478 100644
--- a/drivers/pci/hotplug/acpiphp_core.c
+++ b/drivers/pci/hotplug/acpiphp_core.c
@@ -429,14 +429,17 @@ static void __exit cleanup_slots (void)
 static int __init acpiphp_init(void)
 {
 	int retval;
+	int docking_station;
 
 	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 
 	acpiphp_debug = debug;
 
+	docking_station = find_dock_station();
+
 	/* read all the ACPI info from the system */
 	retval = init_acpi();
-	if (retval)
+	if (retval && !(docking_station))
 		return retval;
 
 	return init_slots();
@@ -448,6 +451,8 @@ static void __exit acpiphp_exit(void)
 	cleanup_slots();
 	/* deallocate internal data structures etc. */
 	acpiphp_glue_exit();
+
+	remove_dock_station();
 }
 
 module_init(acpiphp_init);