IPoIB: Fix deadlock between ipoib_open() and child interface create

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Fix a deadlock between child interface creation/deletion and ipoib
start/stop.  The former takes vlan_mutex, and then might take RTNL via
register_netdev()/unregister_netdev().  The latter is executed with
RTNL held, and tries to take vlan_mutex, which can lead to an AB-BA
deadlock.

Fix this by having the child interface creation/deletion code take the
RTNL first so vlan_mutex always nests inside RTNL.  We can use
register_netdevice() for child interfaces because we form the
interface name from the parent interface and hence don't need the '%'
expansion of register_netdev().

Reported-by: Yossi Etigin <yosefe@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

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This commit is contained in:

Roland Dreier 2009-01-14 21:44:39 -08:00

parent b8a1b1ce14

commit cbbe1efa49

1 changed files with 8 additions and 3 deletions

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11

drivers/infiniband/ulp/ipoib/ipoib_vlan.c

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