Avoid panic in ofwbus caused by not released resource list entry

After resource allocation and release, resource list entry
stays non-NULL. This causes panic in ofwbus_alloc_resource()
on subsequent resource allocation.
Clean appropriate list entry on release to avoid this.

Obtained from:	Semihalf
Reviewed by:	ian
Sponsored by:	The FreeBSD Foundation

1 files changed, 7 insertions, 1 deletions

diff --git a/sys/dev/ofw/ofwbus.c b/sys/dev/ofw/ofwbus.c
index 2b975ac1aa11..78da4810d9ae 100644
--- a/sys/dev/ofw/ofwbus.c
+++ b/sys/dev/ofw/ofwbus.c
@@ -399,11 +399,17 @@ ofwbus_adjust_resource(device_t bus, device_t child __unused, int type,
 }
 
 static int
-ofwbus_release_resource(device_t bus __unused, device_t child, int type,
+ofwbus_release_resource(device_t bus, device_t child, int type,
     int rid, struct resource *r)
 {
+	struct resource_list_entry *rle;
 	int error;
 
+	/* Clean resource list entry */
+	rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), type, rid);
+	if (rle != NULL)
+		rle->res = NULL;
+
 	if ((rman_get_flags(r) & RF_ACTIVE) != 0) {
 		error = bus_deactivate_resource(child, type, rid, r);
 		if (error)