arm64: dts: rockchip: enable mbox related for rk3368-tb

[firefly-linux-kernel-4.4.55.git] / fs / sysfs / file.c

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index f35523d4fa3a6d657260e7b04d5273db2dcd53b1..b803213d1307e9137c3bfe5e04ee4ac5bd396cce 100644 (file)
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -114,9 +114,15 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
         * If buf != of->prealloc_buf, we don't know how
         * large it is, so cannot safely pass it to ->show
         */
-       if (pos || WARN_ON_ONCE(buf != of->prealloc_buf))
+       if (WARN_ON_ONCE(buf != of->prealloc_buf))
                return 0;
        len = ops->show(kobj, of->kn->priv, buf);
+       if (pos) {
+               if (len <= pos)
+                       return 0;
+               len -= pos;
+               memmove(buf, buf + pos, len);
+       }
        return min(count, len);
 }