1 files changed, 2 insertions, 1 deletions

diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index d705125665f0..98d22f495cd8 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -602,7 +602,8 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
                atomic_read(&cookie->n_active), retire);
 
         /* No further netfs-accessing operations on this cookie permitted */
-        set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags);
+        if (test_and_set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags))
+                BUG();
 
         __fscache_disable_cookie(cookie, retire);