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authorYing Xue <ying.xue@windriver.com>2014-10-20 14:44:25 +0800
committerDavid S. Miller <davem@davemloft.net>2014-10-21 15:28:15 -0400
commit7b8613e0a1502b43b3b36c93c66f835c891f63b3 (patch)
treea2152fd6e1094c6716855e1ae5a4299f1c95a203 /Documentation/btmrvl.txt
parent73829bf6fec70703f10e360676d81d327f21ebf6 (diff)
downloadlinux-7b8613e0a1502b43b3b36c93c66f835c891f63b3.tar.gz
tipc: fix a potential deadlock
Locking dependency detected below possible unsafe locking scenario: CPU0 CPU1 T0: tipc_named_rcv() tipc_rcv() T1: [grab nametble write lock]* [grab node lock]* T2: tipc_update_nametbl() tipc_node_link_up() T3: tipc_nodesub_subscribe() tipc_nametbl_publish() T4: [grab node lock]* [grab nametble write lock]* The opposite order of holding nametbl write lock and node lock on above two different paths may result in a deadlock. If we move the the updating of the name table after link state named out of node lock, the reverse order of holding locks will be eliminated, and as a result, the deadlock risk. Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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