9687966318
"Occasionally a blocking open of dcm port 0 will hang in ttyopen() waiting for carrier detect to be asserted when it's already present. The problem is that dcmmint() will return before updating the value of sc->sc_mcndlast if the device is not open. If carrier detect drops after the device is closed, sc->sc_mcndlast will no longer correctly represent the "previous" state of the signals when the next transition of carrier detect occurs. A subsequent blocking open will wait forever for an event which has in fact taken place." |
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