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| author | Junichi Nomura <[email protected]> | 2015-10-01 08:31:51 +0000 |
|---|---|---|
| committer | Mike Snitzer <[email protected]> | 2015-10-01 14:40:20 +0000 |
| commit | 2a708cff93f1845b9239bc7d6310aef54e716c6a (patch) | |
| tree | f44436bb8bc6f700ab1ea8d042c505ad2910a428 /drivers/fpga/fpga-mgr.c | |
| parent | Linux 4.3-rc3 (diff) | |
| download | kernel-2a708cff93f1845b9239bc7d6310aef54e716c6a.tar.gz kernel-2a708cff93f1845b9239bc7d6310aef54e716c6a.zip | |
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 <[email protected]>
Fixes: ab7c7bb6f4ab ("dm: hold suspend_lock while suspending device during device deletion")
Acked-by: Mikulas Patocka <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Cc: [email protected]
Diffstat (limited to 'drivers/fpga/fpga-mgr.c')
0 files changed, 0 insertions, 0 deletions