In debugfs it's not enough to just set file mode to read-only to
deny write access to a file, instead just don't provide
the write method unless write access is really requested.
Signed-off-by: NOleg Drokin <green@linuxhacker.ru>
Acked-by: NThomas Renninger <trenn@suse.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>