From: Johannes Berg <johannes@sipsolutions.net>
Date: Wed, 26 Sep 2007 13:19:47 +0000 (+0200)
Subject: [PATCH] mac80211: fix iff_promiscs, iff_allmultis race
X-Git-Tag: v2.6.24-rc1~1454^2~296
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53918994b7c8c3bf0af5f641e1f299856799d883;p=pandora-kernel.git

[PATCH] mac80211: fix iff_promiscs, iff_allmultis race

When we update the counters iff_promiscs and iff_allmultis
in struct ieee80211_local we have no common lock held to
protect them. The problem is that the update to each counter
may not be atomic, so we could end up with iff_promiscs == -1
in unfortunate conditions. To fix it, use atomic_t values.
It doesn't matter whether the two counters are updated
together atomically or not, if there are two invocations
of set_multicast_list we will end up with multiple
configure_filter() invocations of which the latter will always
be correct.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

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