On Sat, 2007-05-05 at 10:43 -0600, Paul Fulghum wrote: > There is not an input flush method for the tty driver > and individual drivers don't process that ioctl. > The tty drivers I've seen immediately pass receive data to the > tty buffering and I'm not sure why a driver would > behave otherwise.
cdc-acm does its own buffering. In your case, the line discipline throttled the tty device because the ldisc buffer was full. If the line discipline throttles the driver input, the cdc-acm driver stops giving data to the tty buffering and instead stores them internally. In the serial driver this usually just results in dropping RTS to signal the remote end to stop sending. The serial driver always immediately gives receive data to the tty buffering without regard to the throttled state. I would argue that cdc-acm should do the same as the serial driver. -- Paul ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
