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[IB] umad: further ib_unregister_mad_agent() deadlock fixes
authorRoland Dreier <rolandd@cisco.com>
Thu, 10 Nov 2005 18:18:23 +0000 (10:18 -0800)
committerRoland Dreier <rolandd@cisco.com>
Thu, 10 Nov 2005 18:22:51 +0000 (10:22 -0800)
The previous umad deadlock fix left ib_umad_kill_port() still
vulnerable to deadlocking.  This patch fixes that by downgrading our
lock to a read lock when we might end up trying to reacquire the lock
for reading.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

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