interruptible_sleep_on_timeout() has been deprecated for awhile and was finally removed in Linux 3.15. Since interruptible_sleep_on_timeout() uses jiffies for the delay, I assumed that each jiffy equated to 10ms given the age of the driver. Signed-off-by: Shaun Ruffell <sruffell@digium.com> Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com> Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>