[PATCH v4 02/10] fscache: Fix fscache_cookie_enabled() to handle NULL cookie

[David Howells]

Fix fscache_cookie_enabled() to handle being given a NULL cookie pointer
(ie. a cookie was not allocated and caching should be ignored).

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

 include/linux/fscache.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 32f65c16328a..5e3ddb11715a 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -167,7 +167,8 @@ struct fscache_cookie {
 
 static inline bool fscache_cookie_enabled(struct fscache_cookie *cookie)
 {
-	return test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
+	return (fscache_cookie_valid(cookie) &&
+		test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags));
 }
 
 /*