1 files changed, 16 insertions, 3 deletions

diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index d5417da7f792..5b1d0642c749 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -111,6 +111,7 @@ static int cachefiles_daemon_open(struct inode *inode, struct file *file)
 	INIT_LIST_HEAD(&cache->volumes);
 	INIT_LIST_HEAD(&cache->object_list);
 	spin_lock_init(&cache->object_list_lock);
+	refcount_set(&cache->unbind_pincount, 1);
 	xa_init_flags(&cache->reqs, XA_FLAGS_ALLOC);
 	xa_init_flags(&cache->ondemand_ids, XA_FLAGS_ALLOC1);
 
@@ -164,6 +165,20 @@ static void cachefiles_flush_reqs(struct cachefiles_cache *cache)
 	xa_destroy(&cache->ondemand_ids);
 }
 
+void cachefiles_put_unbind_pincount(struct cachefiles_cache *cache)
+{
+	if (refcount_dec_and_test(&cache->unbind_pincount)) {
+		cachefiles_daemon_unbind(cache);
+		cachefiles_open = 0;
+		kfree(cache);
+	}
+}
+
+void cachefiles_get_unbind_pincount(struct cachefiles_cache *cache)
+{
+	refcount_inc(&cache->unbind_pincount);
+}
+
 /*
  * Release a cache.
  */
@@ -179,14 +194,12 @@ static int cachefiles_daemon_release(struct inode *inode, struct file *file)
 
 	if (cachefiles_in_ondemand_mode(cache))
 		cachefiles_flush_reqs(cache);
-	cachefiles_daemon_unbind(cache);
 
 	/* clean up the control file interface */
 	cache->cachefilesd = NULL;
 	file->private_data = NULL;
-	cachefiles_open = 0;
 
-	kfree(cache);
+	cachefiles_put_unbind_pincount(cache);
 
 	_leave("");
 	return 0;