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Avoid crashing if we are forced to close() before teh open() completed 

(can happen on disconnect, probably due do dubious logic in vdevgone()).
This commit is contained in:
augustss 1999-07-14 19:12:07 +00:00
parent 12a0758a42
commit 021319d9b3
1 changed files with 10 additions and 6 deletions
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16
sys/dev/usb/ulpt.c
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@ -1,4 +1,4 @@
/* $NetBSD: ulpt.c,v 1.12 1999/06/30 06:44:23 augustss Exp $ */
/* $NetBSD: ulpt.c,v 1.13 1999/07/14 19:12:07 augustss Exp $ */
/*
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -313,10 +313,10 @@ ulptopen(dev, flag, mode, p)
USB_GET_SC_OPEN(ulpt, ULPTUNIT(dev), sc);
if (!sc || !sc->sc_iface || sc->sc_dying)
return ENXIO;
return (ENXIO);
if (sc->sc_state)
return EBUSY;
return (EBUSY);
sc->sc_state = ULPT_INIT;
sc->sc_flags = flags;
@ -328,14 +328,14 @@ ulptopen(dev, flag, mode, p)
for (spin = 0; (ulpt_status(sc) & LPS_SELECT) == 0; spin += STEP) {
if (spin >= TIMEOUT) {
sc->sc_state = 0;
return EBUSY;
return (EBUSY);
}
/* wait 1/4 second, give up if we get a signal */
error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "ulptop", STEP);
if (error != EWOULDBLOCK) {
sc->sc_state = 0;
return error;
return (error);
}
}
@ -369,7 +369,7 @@ ulpt_statusmsg(status, sc)
else if (new & LPS_NERR)
log(LOG_NOTICE, "%s: output error\n", USBDEVNAME(sc->sc_dev));
return status;
return (status);
}
int
@ -381,6 +381,10 @@ ulptclose(dev, flag, mode, p)
{
USB_GET_SC(ulpt, ULPTUNIT(dev), sc);
if (sc->sc_state != ULPT_OPEN)
/* We are being forced to close before the open completed. */
return (0);
usbd_close_pipe(sc->sc_bulkpipe);
sc->sc_bulkpipe = 0;