ieee1394: nodemgr: grab class.subsys.rwsem in nodemgr_resume_ne

nodemgr_resume_ne was iterating over nodemgr_ud_class.children without
protection by nodemgr_ud_class.subsys.rwsem.

FIXME:
Shouldn't we rather use class->sem there, not class->subsys.rwsem?

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
index f087f7e2b691..3e7974c57443 100644
--- a/drivers/ieee1394/nodemgr.c
+++ b/drivers/ieee1394/nodemgr.c
@@ -1352,6 +1352,7 @@ static void nodemgr_resume_ne(struct node_entry *ne)
         ne->in_limbo = 0;
         device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
 
+        down_read(&nodemgr_ud_class.subsys.rwsem);
         down_read(&ne->device.bus->subsys.rwsem);
         list_for_each_entry(cdev, &nodemgr_ud_class.children, node) {
                 ud = container_of(cdev, struct unit_directory, class_dev);
@@ -1363,6 +1364,7 @@ static void nodemgr_resume_ne(struct node_entry *ne)
                         ud->device.driver->resume(&ud->device);
         }
         up_read(&ne->device.bus->subsys.rwsem);
+        up_read(&nodemgr_ud_class.subsys.rwsem);
 
         HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
                    NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);