From: Johannes Berg <johannes@sipsolutions.net>
Date: Thu, 21 Feb 2008 13:09:30 +0000 (+0100)
Subject: mac80211: atomically check whether STA exists already
X-Git-Tag: v2.6.26-rc1~1138^2~530^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=43ba7e958f2ca05e4e9171a15402288419289d71;p=pandora-kernel.git

mac80211: atomically check whether STA exists already

When a STA structure is added, it is often checked whether it
already exists before adding it. This, however, isn't done
atomically so there is a race condition that could lead to two
STA structures being added with the same MAC address. This
patch changes sta_info_add() to return an ERR_PTR in case
of failure and adds the failure mode -EEXIST when the STA
already exists.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Luis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

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