From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Sun, 23 Oct 2005 06:37:48 +0000 (+1000)
Subject: [NEIGH] Fix add_timer race in neigh_add_timer
X-Git-Tag: v2.6.14~40^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6fb9974f49f7a6032118c5b6caa6e08e7097913e;p=pandora-kernel.git

[NEIGH] Fix add_timer race in neigh_add_timer

neigh_add_timer cannot use add_timer unconditionally.  The reason is that
by the time it has obtained the write lock someone else (e.g., neigh_update)
could have already added a new timer.

So it should only use mod_timer and deal with its return value accordingly.

This bug would have led to rare neighbour cache entry leaks.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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