The order of the pages allocated for the driver buffer must be stored before
allocation because it is used in freeing already allocated pages if
allocation fails.
Signed-off-by: NKai Makisara <kai.makisara@kolumbus.fi>
Reported-by: NLukas Kolbe <lkolbe@techfak.uni-bielefeld.de>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>