mac80211: atomically check whether STA exists already

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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>

...

This commit is contained in:

Johannes Berg 2008-02-21 14:09:30 +01:00 • committed by John W. Linville

parent d46e144b65

commit 43ba7e958f

5 changed files with 36 additions and 27 deletions

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11

net/mac80211/cfg.c

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4

net/mac80211/ieee80211.c

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6

net/mac80211/ieee80211_sta.c

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44

net/mac80211/sta_info.c

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4

net/mac80211/sta_info.h

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