diff options
| -rw-r--r-- | sys/dev/sio/sio.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c index 5133064..76eade6 100644 --- a/sys/dev/sio/sio.c +++ b/sys/dev/sio/sio.c @@ -3092,6 +3092,7 @@ siocnputc(dev, c) dev_t dev; int c; { + int need_unlock; int s; struct siocnstate sp; Port_t iobase; @@ -3101,13 +3102,16 @@ siocnputc(dev, c) else iobase = siocniobase; s = spltty(); - if (sio_inited) + need_unlock = 0; + if (sio_inited == 2 && !mtx_owned(&sio_lock)) { mtx_lock_spin(&sio_lock); + need_unlock = 1; + } siocnopen(&sp, iobase, comdefaultrate); siocntxwait(iobase); outb(iobase + com_data, c); siocnclose(&sp, iobase); - if (sio_inited) + if (need_unlock) mtx_unlock_spin(&sio_lock); splx(s); } |
