rtnetlink: add reference counting to prevent module unload while dump is in progress

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I don't see what prevents rmmod (unregister_all is called) while a dump
is active.

Even if we'd add rtnl lock/unlock pair to unregister_all (as done here),
thats not enough either as rtnl_lock is released right before the dump
process starts.

So this adds a refcount:
 * acquire rtnl mutex
 * bump refcount
 * release mutex
 * start the dump

... and make unregister_all remove the callbacks (no new dumps possible)
and then wait until refcount is 0.

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Florian Westphal 2017-08-09 20:41:49 +02:00 • committed by David S. Miller

parent b97bac64a5

commit 019a316992

1 changed files with 13 additions and 1 deletions

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net/core/rtnetlink.c

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