From: Bob Copeland Date: Tue, 5 Nov 2013 19:16:51 +0000 (-0800) Subject: mac80211: hold sta->lock across plink switch statements X-Git-Tag: accepted/tizen/common/20141203.182822~719^2~3^2^2~291 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0f5ffd24fb732fb4d653a8ee97faea767a0e7172;p=platform%2Fkernel%2Flinux-arm64.git mac80211: hold sta->lock across plink switch statements Rather than unlock at the end of each case, do it once after all is said and done. Signed-off-by: Bob Copeland Signed-off-by: Johannes Berg --- diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c index d45826e..c3a3faf 100644 --- a/net/mac80211/mesh_plink.c +++ b/net/mac80211/mesh_plink.c @@ -575,7 +575,6 @@ static void mesh_plink_timer(unsigned long data) rand % sta->plink_timeout; ++sta->plink_retries; mod_plink_timer(sta, sta->plink_timeout); - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_OPEN; break; } @@ -587,19 +586,17 @@ static void mesh_plink_timer(unsigned long data) reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT); sta->plink_state = NL80211_PLINK_HOLDING; mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_CLOSE; break; case NL80211_PLINK_HOLDING: /* holding timer */ del_timer(&sta->plink_timer); mesh_plink_fsm_restart(sta); - spin_unlock_bh(&sta->lock); break; default: - spin_unlock_bh(&sta->lock); break; } + spin_unlock_bh(&sta->lock); if (action) mesh_plink_frame_tx(sdata, action, sta->sta.addr, llid, plid, reason); @@ -856,12 +853,10 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, reason = 0; spin_lock_bh(&sta->lock); switch (sta->plink_state) { - /* spin_unlock as soon as state is updated at each case */ case NL80211_PLINK_LISTEN: switch (event) { case CLS_ACPT: mesh_plink_fsm_restart(sta); - spin_unlock_bh(&sta->lock); break; case OPN_ACPT: sta->plink_state = NL80211_PLINK_OPN_RCVD; @@ -874,11 +869,9 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, /* set the non-peer mode to active during peering */ changed |= ieee80211_mps_local_status_update(sdata); - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_OPEN; break; default: - spin_unlock_bh(&sta->lock); break; } break; @@ -897,14 +890,12 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, mshcfg->dot11MeshHoldingTimeout)) sta->ignore_plink_timer = true; - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_CLOSE; break; case OPN_ACPT: /* retry timer is left untouched */ sta->plink_state = NL80211_PLINK_OPN_RCVD; sta->plid = plid; - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_CONFIRM; break; case CNF_ACPT: @@ -913,10 +904,8 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, mshcfg->dot11MeshConfirmTimeout)) sta->ignore_plink_timer = true; - spin_unlock_bh(&sta->lock); break; default: - spin_unlock_bh(&sta->lock); break; } break; @@ -935,17 +924,14 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, mshcfg->dot11MeshHoldingTimeout)) sta->ignore_plink_timer = true; - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_CLOSE; break; case OPN_ACPT: - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_CONFIRM; break; case CNF_ACPT: del_timer(&sta->plink_timer); sta->plink_state = NL80211_PLINK_ESTAB; - spin_unlock_bh(&sta->lock); changed |= mesh_plink_inc_estab_count(sdata); changed |= mesh_set_ht_prot_mode(sdata); changed |= mesh_set_short_slot_time(sdata); @@ -956,7 +942,6 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, mshcfg->power_mode); break; default: - spin_unlock_bh(&sta->lock); break; } break; @@ -975,13 +960,11 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, mshcfg->dot11MeshHoldingTimeout)) sta->ignore_plink_timer = true; - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_CLOSE; break; case OPN_ACPT: del_timer(&sta->plink_timer); sta->plink_state = NL80211_PLINK_ESTAB; - spin_unlock_bh(&sta->lock); changed |= mesh_plink_inc_estab_count(sdata); changed |= mesh_set_ht_prot_mode(sdata); changed |= mesh_set_short_slot_time(sdata); @@ -993,7 +976,6 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, mshcfg->power_mode); break; default: - spin_unlock_bh(&sta->lock); break; } break; @@ -1006,17 +988,14 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, changed |= __mesh_plink_deactivate(sta); sta->plink_state = NL80211_PLINK_HOLDING; mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); - spin_unlock_bh(&sta->lock); changed |= mesh_set_ht_prot_mode(sdata); changed |= mesh_set_short_slot_time(sdata); action = WLAN_SP_MESH_PEERING_CLOSE; break; case OPN_ACPT: - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_CONFIRM; break; default: - spin_unlock_bh(&sta->lock); break; } break; @@ -1026,26 +1005,24 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, if (del_timer(&sta->plink_timer)) sta->ignore_plink_timer = 1; mesh_plink_fsm_restart(sta); - spin_unlock_bh(&sta->lock); break; case OPN_ACPT: case CNF_ACPT: case OPN_RJCT: case CNF_RJCT: - spin_unlock_bh(&sta->lock); action = WLAN_SP_MESH_PEERING_CLOSE; break; default: - spin_unlock_bh(&sta->lock); + break; } break; default: /* should not get here, PLINK_BLOCKED is dealt with at the * beginning of the function */ - spin_unlock_bh(&sta->lock); break; } + spin_unlock_bh(&sta->lock); if (action) { mesh_plink_frame_tx(sdata, action, sta->sta.addr, sta->llid, sta->plid, sta->reason);