fix a divide by zero problem

SCCS-vsn: sys/hp300/dev/st.c 8.4

diff --git a/usr/src/sys/hp300/dev/st.c b/usr/src/sys/hp300/dev/st.c
index 25ece21..cfc8887 100644 (file)
--- a/usr/src/sys/hp300/dev/st.c
+++ b/usr/src/sys/hp300/dev/st.c
@@ -11,7 +11,7 @@
  *
  * from: Utah $Hdr: st.c 1.11 92/01/21$
  *
  *
  * from: Utah $Hdr: st.c 1.11 92/01/21$
  *

- *      @(#)st.c       8.3 (Berkeley) %G%
+ *      @(#)st.c       8.4 (Berkeley) %G%

  */
 
 /*
  */
 
 /*


@@ -923,10 +923,12 @@ stioctl(dev, cmd, data, flag)
                                 xp->exb_xsense.tplft1 << 8 |
                                 xp->exb_xsense.tplft0);
                        mtget->mt_resid = resid / 1000;
                                 xp->exb_xsense.tplft1 << 8 |
                                 xp->exb_xsense.tplft0);
                        mtget->mt_resid = resid / 1000;

-                       mtget->mt_erreg |= (((xp->exb_xsense.rwerrcnt2 << 16 |
-                                             xp->exb_xsense.rwerrcnt1 << 8 |
-                                             xp->exb_xsense.rwerrcnt0) * 100) / 
-                                           (sc->sc_numblks - resid)) & 0xff;
+                       if (sc->sc_numblks - resid)
+                               mtget->mt_erreg |=
+                                       (((xp->exb_xsense.rwerrcnt2 << 16 |
+                                          xp->exb_xsense.rwerrcnt1 << 8 |
+                                          xp->exb_xsense.rwerrcnt0) * 100) / 
+                                        (sc->sc_numblks - resid)) & 0xff;

                } else if (xp->sc_xsense.valid) {
                        resid = ((xp->sc_xsense.info1 << 24) |
                                 (xp->sc_xsense.info2 << 16) |
                } else if (xp->sc_xsense.valid) {
                        resid = ((xp->sc_xsense.info1 << 24) |
                                 (xp->sc_xsense.info2 << 16) |