Make detaching drivers from PCI devices more robust. While here, fix a

bug where a PCI device would be powered down if it failed to probe, but
not when its driver was detached (e.g. via kldunload).
- Add a new helper method resource_list_release_active() which forcefully
  releases any active resources of a specified type from a resource list.
- Add a bus_child_detached method for the PCI bus driver which forces any
  active resources to be released (and whines to the console if it finds
  any) and then powers the device down.
- Call pci_child_detached() if we fail to probe a device when a driver
  is kldloaded.  This isn't perfect but can avoid leaking resources
  from a probe() routine in the kldload case.

Reviewed by:	imp, brooks
MFC after:	1 month

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/sys/bus.h b/sys/sys/bus.h
index 152b067..06e0f6c 100644
--- a/sys/sys/bus.h
+++ b/sys/sys/bus.h
@@ -273,6 +273,9 @@ struct resource *
 int	resource_list_release(struct resource_list *rl,
 			      device_t bus, device_t child,
 			      int type, int rid, struct resource *res);
+int	resource_list_release_active(struct resource_list *rl,
+				     device_t bus, device_t child,
+				     int type);
 struct resource *
 	resource_list_reserve(struct resource_list *rl,
 			      device_t bus, device_t child,