> I meant "Either some function similar to userspace's poll() is > needed, ...". Something like uart_dev_wait_for_rx()
You can't really do that - it might never return and then how do you want to handle timeouts and cleanups > Alternatively the rx function could be a callback, that > is called when there is new data. That's what the existing API gives you as an ldisc, it can't be immediate in many cases however but must be buffered. > > I'm assuming the only immediate consumers are in-kernel. > > Yes, but the driver should be notified about incoming data. Alan
