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authorFlorian Zumbiehl <florz@florz.de>2007-04-20 19:57:27 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-26 01:29:19 -0400
commit74b885cf86def9bc836772e3c1788c00b72a35c9 (patch)
tree2397bcd487363cdda290c71856af59f0e6cf2ffe /drivers/net/pppox.c
parentbfafb26e11849fe99e03cc1902a91f7f65354e47 (diff)
[PPPOE]: race between interface going down and connect()
below you find a patch that (hopefully) fixes a race between an interface going down and a connect() to a peer on that interface. Before, connect() would determine that an interface is up, then the interface could go down and all entries referring to that interface in the item_hash_table would be marked as ZOMBIEs and their references to the device would be freed, and after that, connect() would put a new entry into the hash table referring to the device that meanwhile is down already - which also would cause unregister_netdevice() to wait until the socket has been release()d. This patch does not suffice if we are not allowed to accept connect()s referring to a device that we already acked a NETDEV_GOING_DOWN for (that is: all references are only guaranteed to be freed after NETDEV_DOWN has been acknowledged, not necessarily after the NETDEV_GOING_DOWN already). And if we are allowed to, we could avoid looking through the hash table upon NETDEV_GOING_DOWN completely and only do that once we get the NETDEV_DOWN ... mostrows: pppoe_flush_dev is called on NETDEV_GOING_DOWN and NETDEV_DOWN to deal with this "late connect" issue. Ideally one would hope to notify users at the "NETDEV_GOING_DOWN" phase (just to pretend to be nice). However, it is the NETDEV_DOWN scan that takes all the responsibility for ensuring nobody is hanging around at that time. Signed-off-by: Florian Zumbiehl <florz@florz.de> Acked-by: Michal Ostrowski <mostrows@earthlink.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/pppox.c')
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