This patch (as1610) replaces multiplication and divison operations in ehci-hcd's isochronous scheduling code with a bit-mask operation, taking advantage of the fact that isochronous periods are always powers of 2. Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/ehci-sched.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: usb-3.6/drivers/usb/host/ehci-sched.c =================================================================== --- usb-3.6.orig/drivers/usb/host/ehci-sched.c +++ usb-3.6/drivers/usb/host/ehci-sched.c @@ -1416,7 +1416,7 @@ iso_stream_schedule ( /* Behind the scheduling threshold? Assume URB_ISO_ASAP. */ if (unlikely(start < next)) - start += period * DIV_ROUND_UP(next - start, period); + start += (next - start + period - 1) & (- period); start += base; } -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
