Comment 5 for bug 1541510

fdasd_check_volume calls vtoc_set_freespace with anc->geo.heads argument

fdasd_check_volume is called from dasd_probe

which before calling fdasd_check_volume called fdasd_get_geometry, which did iocl call, and filled the geometry with:

Heads 0
Secotrs 0
Cylinders 1023
Start 4397693661968

thus in vtoc_set_freespace we end up with division by zero and blow up