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dm mpath: fix racey management of PG initialization

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Commit 935fcc56ab ("dm mpath: only flush workqueue when needed")
changed flush_multipath_work() to avoid needless workqueue
flushing (of a multipath global workqueue). But that change didn't
realize the surrounding flush_multipath_work() code should also only
run if 'pg_init_in_progress' is set.

Fix this by only doing all of flush_multipath_work()'s PG init related
work if 'pg_init_in_progress' is set.

Otherwise multipath_wait_for_pg_init_completion() will run
unconditionally but the preceeding flush_workqueue(kmpath_handlerd)
may not. This could lead to deadlock (though only if kmpath_handlerd
never runs a corresponding work to decrement 'pg_init_in_progress').

It could also be, though highly unlikely, that the kmpath_handlerd
work that does PG init completes before 'pg_init_in_progress' is set,
and then an intervening DM table reload's multipath_postsuspend()
triggers flush_multipath_work().

Fixes: 935fcc56ab ("dm mpath: only flush workqueue when needed")
Cc: stable@vger.kernel.org
Reported-by: Ben Marzinski <bmarzins@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2020-08-24 14:19:55 -04:00
parent f9e040efcc
commit c322ee9320
1 changed files with 15 additions and 7 deletions
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22
drivers/md/dm-mpath.c
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@ -1287,17 +1287,25 @@ static void multipath_wait_for_pg_init_completion(struct multipath *m)
static void flush_multipath_work(struct multipath *m)
{
if (m->hw_handler_name) {
set_bit(MPATHF_PG_INIT_DISABLED, &m->flags);
smp_mb__after_atomic();
unsigned long flags;
if (!atomic_read(&m->pg_init_in_progress))
goto skip;
spin_lock_irqsave(&m->lock, flags);
if (atomic_read(&m->pg_init_in_progress) &&
!test_and_set_bit(MPATHF_PG_INIT_DISABLED, &m->flags)) {
spin_unlock_irqrestore(&m->lock, flags);
if (atomic_read(&m->pg_init_in_progress))
flush_workqueue(kmpath_handlerd);
multipath_wait_for_pg_init_completion(m);
multipath_wait_for_pg_init_completion(m);
clear_bit(MPATHF_PG_INIT_DISABLED, &m->flags);
smp_mb__after_atomic();
spin_lock_irqsave(&m->lock, flags);
clear_bit(MPATHF_PG_INIT_DISABLED, &m->flags);
}
spin_unlock_irqrestore(&m->lock, flags);
}
skip:
if (m->queue_mode == DM_TYPE_BIO_BASED)
flush_work(&m->process_queued_bios);
flush_work(&m->trigger_event);