Hi,
Since proctree_lock is a sx lock which uses 2 condition variables,
they alredy drop Giant (DROP_GIANT()) before sleeping. Are you secure
it is the right thing to do here?
Sorry, the commit message was not 100% clear. It should have been:
Retest a variable after sx_slock has been called. Giant might have been
temporarily dropped while waiting for proctree_lock, allowing for an
intervening tty_close() that cleared tp->t_session.
Martin
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