2.6.38-stable review patch. If anyone has any objections, please let us know.
------------------ From: Johannes Berg <[email protected]> commit 243e6df4ed919880d079d717641ad699c6530a03 upstream. The locking with SMPS requests means that the debugs file should lock the mgd mutex, not the iflist mutex. Calls to __ieee80211_request_smps() need to hold that mutex, so add an assertion. This has always been wrong, but for some reason never been noticed, probably because the locking error only happens while unassociated. Signed-off-by: Johannes Berg <[email protected]> Signed-off-by: John W. Linville <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- net/mac80211/cfg.c | 2 ++ net/mac80211/debugfs_netdev.c | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -1471,6 +1471,8 @@ int __ieee80211_request_smps(struct ieee enum ieee80211_smps_mode old_req; int err; + lockdep_assert_held(&sdata->u.mgd.mtx); + old_req = sdata->u.mgd.req_smps; sdata->u.mgd.req_smps = smps_mode; --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -172,9 +172,9 @@ static int ieee80211_set_smps(struct iee if (sdata->vif.type != NL80211_IFTYPE_STATION) return -EOPNOTSUPP; - mutex_lock(&local->iflist_mtx); + mutex_lock(&sdata->u.mgd.mtx); err = __ieee80211_request_smps(sdata, smps_mode); - mutex_unlock(&local->iflist_mtx); + mutex_unlock(&sdata->u.mgd.mtx); return err; } _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
