UPSTREAM: ubifs: Fix ubifs_assert_cmt_locked()

U-Boot does not implement down_write_trylock() and its stub always returns
true that lock was acquired. Therefore ubifs_assert_cmt_locked() assert
currently always fails.

Fix this issue by redefining ubifs_assert_cmt_locked() to just empty stub
as there is nothing to assert.

Change-Id: I8daa938645cd75d0eb4269ff0994163a02c3ff13
Signed-off-by: Pali Rohár <[email protected]>
Signed-off-by: Jon Lin <[email protected]>
(cherry picked from commit b4f2105)

Author: pali

fs/ubifs/debug.h

@@ -174,13 +174,7 @@ struct ubifs_global_debug_info {
 	}                                                                      \
 } while (0)
 
-#define ubifs_assert_cmt_locked(c) do {                                        \
-	if (unlikely(down_write_trylock(&(c)->commit_sem))) {                  \
-		up_write(&(c)->commit_sem);                                    \
-		pr_debug("commit lock is not locked!\n");                      \
-		ubifs_assert(0);                                               \
-	}                                                                      \
-} while (0)
+#define ubifs_assert_cmt_locked(c) do { } while (0)
 
 #define ubifs_dbg_msg(type, fmt, ...) \
 	pr_debug("UBIFS DBG " type ": " fmt "\n",                              \