X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=fs%2Fgfs2%2Fglock.c;h=9cd8c92b953d164294fcc48a5bc5e4a415732fd4;hb=10f1d169d99b15885f47959d088d2530bf36be9e;hp=32e74710b1aae4a68e24b2b417622fe417f76536;hpb=5ca9d3a4286a1a4aaa46acc7c1c29a15d8d0fea2;p=firefly-linux-kernel-4.4.55.git

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 32e74710b1aa..9cd8c92b953d 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -651,9 +651,11 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
 	struct kmem_cache *cachep;
 	int ret, tries = 0;
 
+	rcu_read_lock();
 	gl = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
 	if (gl && !lockref_get_not_dead(&gl->gl_lockref))
 		gl = NULL;
+	rcu_read_unlock();
 
 	*glp = gl;
 	if (gl)
@@ -721,15 +723,18 @@ again:
 
 	if (ret == -EEXIST) {
 		ret = 0;
+		rcu_read_lock();
 		tmp = rhashtable_lookup_fast(&gl_hash_table, &name, ht_parms);
 		if (tmp == NULL || !lockref_get_not_dead(&tmp->gl_lockref)) {
 			if (++tries < 100) {
+				rcu_read_unlock();
 				cond_resched();
 				goto again;
 			}
 			tmp = NULL;
 			ret = -ENOMEM;
 		}
+		rcu_read_unlock();
 	} else {
 		WARN_ON_ONCE(ret);
 	}