I am awfully sorry, but that patch contained a bug. The code dereferenced
cmd->back as if it were a pointer to a request even when it wasn't. It worked
by accident, because rq->flags overlapped with a zeroed memory in other case.
Here is a corrective patch.
Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>