Peter Wemm
446fe15067
Apply a bandaid to a problem elsewhere in the driver, when the process is ...
blocked in a write() while waiting for the output to drain, sleep only
for tp->t_timeout, not forever. This only seems to happen when there is
either a modem lockup holding the hardware flow control down, or due to
some problem in the driver with processes attempting to write after the
modem has hung up (eg: elm, tf).
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446fe15067