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Bring back the fix from 1.32 that got spammed by recent changes.

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This commit is contained in:
Nate Williams 1997-01-16 18:57:19 +00:00
parent 6bed7e5140
commit 4ee1132018
1 changed files with 6 additions and 1 deletions
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7
sys/i386/isa/psm.c
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@ -492,6 +492,8 @@ psmprobe(struct isa_device *dvp)
if (unit >= NPSM)
return (0);
psm_softc[unit] = NULL;
sc = malloc(sizeof *sc, M_DEVBUF, M_NOWAIT);
bzero(sc, sizeof *sc);
@ -728,6 +730,9 @@ psmattach(struct isa_device *dvp)
int unit = dvp->id_unit;
struct psm_softc *sc = psm_softc[unit];
if (sc == NULL) /* shouldn't happen */
return (0);
/* initial operation mode */
sc->dflt_mode.accelfactor = sc->mode.accelfactor = PSM_ACCEL;
sc->dflt_mode.protocol = sc->mode.protocol = MOUSE_PROTO_PS2;
@ -771,7 +776,7 @@ psmopen(dev_t dev, int flag, int fmt, struct proc *p)
/* Get device data */
sc = psm_softc[unit];
if ((sc->state & PSM_VALID) == 0)
if ((sc == NULL) || (sc->state & PSM_VALID) == 0)
/* the device is no longer valid/functioning */
return (ENXIO);