hash_string: Fix zero-length case for !DCACHE_WORD_ACCESS

The self-test was updated to cover zero-length strings; the function
needs to be updated, too.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: George Spelvin <linux@sciencehorizons.net>
Fixes: fcfd2fbf22d2 ("fs/namei.c: Add hashlen_string() function")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/namei.c b/fs/namei.c
index 47edc99..4c4f95a 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1968,11 +1968,11 @@ u64 hashlen_string(const char *name)
        unsigned long len = 0, c;
 
        c = (unsigned char)*name;
-       do {
+       while (c) {
                len++;
                hash = partial_name_hash(c, hash);
                c = (unsigned char)name[len];
-       } while (c);
+       }
        return hashlen_create(end_name_hash(hash), len);
 }
 EXPORT_SYMBOL(hashlen_string);