ocfs2/dlm: remove potential deadlock -V3

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When we need to take both dlm_domain_lock and dlm->spinlock, we should take
them in order of: dlm_domain_lock then dlm->spinlock.

There is pathes disobey this order. That is calling dlm_lockres_put() with
dlm->spinlock held in dlm_run_purge_list. dlm_lockres_put() calls dlm_put() at
the ref and dlm_put() locks on dlm_domain_lock.

Fix:
Don't grab/put the dlm when the initialising/releasing lockres.
That grab is not required because we don't call dlm_unregister_domain()
based on refcount.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <joel.becker@oracle.com>

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Wengang Wang 2010-07-30 23:18:00 +08:00 • committed by Joel Becker

parent a524812b7e

commit b11f1f1ab7

1 changed files with 0 additions and 4 deletions

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fs/ocfs2/dlm/dlmmaster.c

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