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Copy the mechanism from ser_/usb_gigaset to avoid producing spurious empty responses for CR/LF sequences from the device. Add a comment in all drivers documenting that behaviour. Correct an off by one error that might result in a one byte buffer overflow when receiving an unexpectedly long reply. Impact: minor bugfix Signed-off-by: Tilman Schmidt <tilman@imap.cc> Signed-off-by: David S. Miller <davem@davemloft.net>