drv_attrs was fully removed from the bus structure in upstream commit e18945b159a1cdbc031f1d3b0b7e515a33bdcbf7 which was merged into 3.13. This is necessary to compile against linux kernel version 3.13. Signed-off-by: Shaun Ruffell <sruffell@digium.com> Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>