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| author | Junichi Nomura <j-nomura@ce.jp.nec.com> | 2015-10-01 08:31:51 +0000 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-10-01 10:40:20 -0400 |
| commit | 2a708cff93f1845b9239bc7d6310aef54e716c6a (patch) | |
| tree | f44436bb8bc6f700ab1ea8d042c505ad2910a428 /drivers/md/dm-raid.c | |
| parent | 9ffecb10283508260936b96022d4ee43a7798b4c (diff) | |
| download | op-kernel-dev-2a708cff93f1845b9239bc7d6310aef54e716c6a.zip op-kernel-dev-2a708cff93f1845b9239bc7d6310aef54e716c6a.tar.gz | |
dm: fix AB-BA deadlock in __dm_destroy()
__dm_destroy() takes io_barrier SRCU lock (dm_get_live_table) and
suspend_lock in reverse order. Doing so can cause AB-BA deadlock:
__dm_destroy dm_swap_table
---------------------------------------------------
mutex_lock(suspend_lock)
dm_get_live_table()
srcu_read_lock(io_barrier)
dm_sync_table()
synchronize_srcu(io_barrier)
.. waiting for dm_put_live_table()
mutex_lock(suspend_lock)
.. waiting for suspend_lock
Fix this by taking the locks in proper order.
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Fixes: ab7c7bb6f4ab ("dm: hold suspend_lock while suspending device during device deletion")
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/dm-raid.c')
0 files changed, 0 insertions, 0 deletions
