diff options
| -rw-r--r-- | sys/dev/usb/ucom.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sys/dev/usb/ucom.c b/sys/dev/usb/ucom.c index f80aa04..aaa06d3 100644 --- a/sys/dev/usb/ucom.c +++ b/sys/dev/usb/ucom.c @@ -532,6 +532,16 @@ ucomstart(struct tty *tp) if (sc->sc_dying) return; + /* + * If there's no sc_oxfer, then ucomclose has removed it. The buffer + * has just been flushed in the ttyflush() in ttyclose(). ttyflush() + * then calls tt_stop(). ucomstop calls ucomstart, so the right thing + * to do here is just abort if sc_oxfer is NULL, as everything else + * is cleaned up elsewhere. + */ + if (sc->sc_oxfer == NULL) + return; + s = spltty(); if (tp->t_state & TS_TBLOCK) { |
