USB: serial: continue to write on errors
Do not discard buffered data and make sure to try to resubmit the write
urbs on errors.
Currently a recoverable error would lead to more data than necessary
Also upgrade error messages from debug to error log level.
Signed-off-by: Johan Hovold <email@example.com>
Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
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