Use make_dev_credf(MAKEDEV_REF) instead of make_dev() from the clone handler. Lock Giant in the clone handler. Use destroy_dev_sched() explicitely from pty_maybecleanup() and postpone pty_release() until both master and slave cdevs are destroyed by setting it as callback for destroy_dev_sched().
Use make_dev_credf(MAKEDEV_REF) instead of make_dev() from the clone handler.
Lock Giant in the clone handler.
Use destroy_dev_sched() explicitely from pty_maybecleanup() and postpone
pty_release() until both master and slave cdevs are destroyed by setting
it as callback for destroy_dev_sched().

Debugging help and testing by:	Peter Holm
Approved by:	re (kensmith)

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