From 83d5cc012441531ab0bf6f99881958e964e9cf11 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 12 Jan 2012 09:31:10 +0100 Subject: mac80211: station state transition error handling In the future, when we start notifying drivers, state transitions could potentially fail. To make it easier to distinguish between programming bugs and driver failures: * rename sta_info_move_state() to sta_info_pre_move_state() which can only be called before the station is inserted (and check this with a new station flag). * rename sta_info_move_state_checked() to just plain sta_info_move_state(), as it will be the regular function that can fail for more than just one reason (bad transition or an error from the driver) This makes the programming model easier -- one of the functions can only be called before insertion and can't fail, the other can fail. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/sta_info.h | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) (limited to 'net/mac80211/sta_info.h') diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index 6f77f12dc3fc..381de37d2478 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -52,6 +52,7 @@ * @WLAN_STA_SP: Station is in a service period, so don't try to * reply to other uAPSD trigger frames or PS-Poll. * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame. + * @WLAN_STA_INSERTED: This station is inserted into the hash table. */ enum ieee80211_sta_info_flags { WLAN_STA_AUTH, @@ -71,6 +72,7 @@ enum ieee80211_sta_info_flags { WLAN_STA_UAPSD, WLAN_STA_SP, WLAN_STA_4ADDR_EVENT, + WLAN_STA_INSERTED, }; enum ieee80211_sta_state { @@ -427,13 +429,17 @@ static inline int test_and_set_sta_flag(struct sta_info *sta, return test_and_set_bit(flag, &sta->_flags); } -int sta_info_move_state_checked(struct sta_info *sta, - enum ieee80211_sta_state new_state); +int sta_info_move_state(struct sta_info *sta, + enum ieee80211_sta_state new_state); -static inline void sta_info_move_state(struct sta_info *sta, - enum ieee80211_sta_state new_state) +static inline void sta_info_pre_move_state(struct sta_info *sta, + enum ieee80211_sta_state new_state) { - int ret = sta_info_move_state_checked(sta, new_state); + int ret; + + WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED)); + + ret = sta_info_move_state(sta, new_state); WARN_ON_ONCE(ret); } @@ -544,6 +550,7 @@ int sta_info_insert(struct sta_info *sta); int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU); int sta_info_reinsert(struct sta_info *sta); +int __must_check __sta_info_destroy(struct sta_info *sta); int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr); int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, -- cgit v1.2.3