From: Sven Wegener <sven.wegener@stealer.net>
Date: Sun, 10 Aug 2008 09:17:59 +0000 (+0000)
Subject: ipvs: Fix possible deadlock in estimator code
X-Git-Tag: v2.6.27-rc4~103^2~43^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8ab19ea36c5c5340ff598e4d15fc084eb65671dc;p=pandora-kernel.git

ipvs: Fix possible deadlock in estimator code

There is a slight chance for a deadlock in the estimator code. We can't call
del_timer_sync() while holding our lock, as the timer might be active and
spinning for the lock on another cpu. Work around this issue by using
try_to_del_timer_sync() and releasing the lock. We could actually delete the
timer outside of our lock, as the add and kill functions are only every called
from userspace via [gs]etsockopt() and are serialized by a mutex, but better
make this explicit.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Cc: stable <stable@kernel.org>
Acked-by: Simon Horman <horms@verge.net.au>
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