jffs2: use mutex_is_locked() in __jffs2_flush_wbuf()

Use a helper to test if a mutex is held instead of a hack with
mutex_trylock().

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Artem Bityutskiy <dedekind1@gmail.com>

diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 4515bea0268fa6ac17f8b2d61bd818bea42b6674..a10fb24ca6e6ede89ec825c68f832ddd7fba89ed 100644 (file)
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -578,8 +578,7 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
        if (!jffs2_is_writebuffered(c))
                return 0;
 
-       if (mutex_trylock(&c->alloc_sem)) {
-               mutex_unlock(&c->alloc_sem);
+       if (!mutex_is_locked(&c->alloc_sem)) {
                printk(KERN_CRIT "jffs2_flush_wbuf() called with alloc_sem not locked!\n");
                BUG();
        }