On Thu, Jun 22, 2006 at 11:33:15AM +0400, Sergei Organov wrote: > One more question, if I get memory for N bytes with > tty_prepare_flip_string() then store M (M <= N) bytes into the buffer, > how do I tell tty layer that only M bytes are in fact stored? You don't. > [I'm thinking about eliminating buffers allocation for urbs as well as > data copy when transferring data from USB subsystem to flip buffers of > the tty subsystem. Currently the flow is: The tty buffers may not be DMAable > and it seems that using tty buffers directly is a better idea: > > - allocate N-bytes data buffer from tty and use it for urb > - submit the urb to USB subsystem > - flip M-bytes of data (M <= N) in USB receive callback. Its doable in theory but is it worth it ? - 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
