NSM: Release nsmhandle in nlm_destroy_host

The nsm_handle's reference count is bumped in nlm_lookup_host().  It
should be decremented in nlm_destroy_host() to make it easier to see
the balance of these two operations.

Move the nsm_release() call to fs/lockd/host.c.

The h_nsmhandle pointer is set in nlm_lookup_host(), and never cleared.
The nlm_destroy_host() function is never called for the same nlm_host
twice, so h_nsmhandle won't ever be NULL when nsm_unmonitor() is
called.

All references to the nlm_host are gone before it is freed.  We can
skip making h_nsmhandle NULL just before the nlm_host is deallocated.

It's also likely we can remove the h_nsmhandle NULL check in
nlmsvc_is_client() as well, but we can do that later when rearchitect-
ing the nlm_host cache.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 0 insertions, 5 deletions

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index aaaa08e..15fab22 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -117,10 +117,6 @@ nsm_unmonitor(struct nlm_host *host)
 	struct nsm_res	res;
 	int		status = 0;
 
-	if (nsm == NULL)
-		return 0;
-	host->h_nsmhandle = NULL;
-
 	if (atomic_read(&nsm->sm_count) == 1
 	 && nsm->sm_monitored && !nsm->sm_sticky) {
 		dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
@@ -132,7 +128,6 @@ nsm_unmonitor(struct nlm_host *host)
 		else
 			nsm->sm_monitored = 0;
 	}
-	nsm_release(nsm);
 	return status;
 }