On Wed, 2015-07-22 at 10:30 -0400, Peter Hurley wrote: > 3. Pre-allocate space _before_ the data arrives (with > tty_buffer_request_room()); > this is applicable to subsystems which know how much data can be > in-flight > at any one time. This guarantees that when rx data arrives buffer > space is > available (since it has already been allocated). > > Drivers that use method 2 typically attempt to recopy the buffered > data > when either new data arrives or @ unthrottle. I've seen others use > deferred > work as well. > > AFAIK no driver/subsystem is using method 3 for guaranteed delivery > of in-flight data, but it seems ideally suited to usb serial. Indeed. But flow control is still done by throttle/unthrottle, isn't it? Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
