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mac80211: fix SMPS debugfs locking 

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.

Cc: stable@kernel.org [2.6.34+]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-04-19 20:44:04 +02:00 committed by John W. Linville
parent 10e99777e9
commit 243e6df4ed
2 changed files with 4 additions and 2 deletions
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2
net/mac80211/cfg.c
View File

@ -1504,6 +1504,8 @@ int __ieee80211_request_smps(struct ieee80211_sub_if_data *sdata,
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;

4
net/mac80211/debugfs_netdev.c
View File

@ -177,9 +177,9 @@ static int ieee80211_set_smps(struct ieee80211_sub_if_data *sdata,
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;
}